Augmentation in Cortex Prime

The following is a system for handling (para)human augmentation, primarily for cyberpunk and other sci-fi settings, but adaptable to steampunk, fantasy settings or any other setting aspect involving implantation and supplementation of natural body systems to achieve spectacular effects.

While the base Cortex Prime Abilities or Powers systems could be skinned to cover the same material, this system attempts to unify this mechanical aspect of Cortex Prime under its own subsystem to both accentuate this component of setting and to provide for a more narratively cogent method of addressing (para)human augmentation.

Using Talents for Augmentation

Rather than using a Trait Set, as the mod below does, to represent Augmentations, you could simply create a list of Talent SFX, with each Talent representing a particular system. This might be the preferred system where augmentations are present in the setting but not a central feature (for instance, Star Wars has cybernetics, but they are typically background dressing).

Grit and Power Levels

At the simplest, these systems can be made a Trait set available to all characters, with a set number of dice to assign between specific traits. This works especially well with cyberpunk settings that have no mystical or magical aspects to balance against.

The relative power of each augmentation system can be adjusted narratively. For instance, does a d8 in Strength systems mean that a character can punch through concrete? Throw a car? Or simply that the character has a level of strength on par with world-class body-builders? Does a character with Cognition d8 have intellectual skills on par with natural geniuses (perhaps a more complex designation than once thought given developing neuroscience) or superhuman skills of calculation and analysis? Of course, the step of the system’s die can be factored in as well—dice at steps d10 or lower may be within the realm of natural human ability, while dice at d12 represent augmentation beyond natural human potential.

These narrative factors can be combined with mechanical effects to further define the relative power of available augmentations. If you are using rules like a Limited Dice Pool, you could have an Augmentation die not apply toward the limit—this will accentuate that augmentation really does allow someone to achieve beyond normal standards. If you’re also using a track for Stress and/or Trauma, you could also allow a player to voluntarily take a point of Stress or Trauma to add a third die (perhaps specifically the Augmentation die) to the result rather than spending a Plot Point to do so. For a middle road, allow the expenditure of a Stress/Trauma “point” to have the Augmentation die not count toward the Dice Pool Limit. I’d map this as an SFX that automatically applies to each System, much like the “Use a d4” mechanic for Distinctions.

These options may work especially well in settings where human augmentation is an important aspect of genre—such as cyberpunk or certain science-fiction. As a more specific example, this might work especially well in a setting like Eclipse Phase, where characters can “resleeve” into different bodies and you want to accentuate the importance of body selection.

The System Itself

The system itself is relatively simple. Rather than seemingly infinitesimally granular selections of particular upgrades and augments, this mod looks at the sum total, classifying the Traits in the Augmentation category as “systems” that represent the overall effect of upgrades. The systems I would recommend using are: Athletics, Charisma, Cognition, Perception, Reflex, Resilience, Stealth.

Whether you use the categories I’ve designated or substitute your own, you should give a general description of the system that explains what sorts of capabilities a person with that System has as a guide to when the die from the System might apply (or when possession of the system grants narrative “permissions” that may not be reflected in mechanics but in the sorts of things the character can do.

Specialized systems providing more discrete and specialized functions can be mapped as SFX. You may consider giving characters a certain number of SFX for free at each dice step or provide that certain SFX are automatically gained at certain dice steps.

If you’re using other Traits that have SFX, or if you’re using Talents, you’ll want to carefully consider whether your choices will lead to “SFX bloat” that will complicate gameplay inordinately over the value they provide. Additionally, you’ll want to think about just how much you want to accentuate Augmentations versus other Trait sets.

If you choose not to use SFX, then you might provide short narrative descriptions of the kinds of capabilities a System has at each die step.

I’ve provided sample write-ups and SFX for my Systems below. Given the length of the article (and constraints on my time), I’ve only included a few sample SFX in each System. When I am able, I’ll supplement those SFX in a subsequent post.

Systems Descriptions

Athletics: Athletics Augs enhance the strength, flexibility and endurance of a character (but not their reaction times, which are enhanced by Reflex Systems). These are the most-commonly thought-of augs for the average person, because they are at once those most obvious in action and those with the most directly frightening consequences.

  • Oh Yeah!: Spend a PP to smash through a wall, even if made of brick or stone.
  • Optimized Cardiovascular System: Spend 1PP to step up or double any Endurance Augs when taking an action. If the action fails, shutdown Athletics Augs. Recover by activating an opportunity in a Bridge scene.
  • Hyper-oxygenated Blood: The die step of any Complication of Difficulty die accounting for fatigue from physical exertion must exceed the Perception Augs die or the character disregards it. For any such Complication that does apply to the character, step it down by one step.

Charisma: Charisma Augs enhance a person’s social capabilities through a number of means. This may include pheromones or other chemical signals, analytical systems providing feedback on observed body language, voice modification for a more mellifluous sound, etc.

  • Empathic Analysis: When including Charisma Augs in a social Reaction, double or step up Charisma Augs. Pay 1 PP to do both.
  • Mood Stabilizer: Spend 1PP to ignore penalties from social or mental Stress or Trauma, or Complications, for a Test.
  • Halo Effect: Spend 1 PP to step up or double Charisma Augs on a test to persuade others. If the action fails, shut down Charisma Augs and recover by activating an Opportunity in a Bridge scene.

Cognition: This System covers augmentations that enhance the computing or analytical power of the human brain. Subsystems tend to enhance object identification, pattern analysis, sensory interpretation, creativity and intellect: human methodologies for competing with the power of artificial intelligence (whether or not that means “sentient and conscious” artificial intelligence or the complicated computing algorithms already in use today).

  • Multitasking: Split Cognition Augs into two dice at one step down or into three dice at two steps down.
  • Flow State: Step up or double Cognition Augs for one action, then step back to two dice at one step down. Recover by activating an Opportunity during a Bridge scene.
  • Probability Analyzer: Spend 1 PP to add Cognition Augs (or step up by one if already in your pool) and reroll all dice on a Reaction.
  • Efficiency Optimizer: Use two or more Systems dice in a single dice pool, reduce each System die for one step for each Systems die added beyond the first.
  • Overclock: Step up or double Cognition Augs for a scene, or spend 1PP to do both. While active, take Mental stress equal to the step up the second-highest-rolling die.

Perception: This System represents augmentations that heighten or expand the sensory perceptions of the individual—the ability to see in other parts of the light spectrum, to filter certain sounds and focus on others, or even the addition of senses that (para)humans don’t normally have—a snake’s heat-sensing pits or a bat’s sonar.

Depending upon the nature of the System, a character with a Perception die may have an image link that can display a sort of Heads-Up Display (HUD), along with video, text and images, directly into the view of the character. They may also have the ability to record photos or videos.

  • Digital Zoom: The die step of any Complication or Difficulty die accounting for distance from the visual must exceed the Perception Augs die or the character disregards it. For any such Complication that does apply to the character, step it down by one step.
  • Enhanced Resolution: In a pool containing Perception Augs, replace two dice of equal steps with one die of +1 step.
  • Flash Suppression: The die step of any Complication of Difficulty die accounting for blinding lights must exceed the Perception Augs die or the character disregards it. For any such Complication that does apply to the character, step it down by one step.
  • Enhanced Spectrum Targeting: Add a d6 to your dice pool for an attack against an opponent at near range you cannot see and step back your highest die by one step.
  • Threat Identification: Spend 1PP to add Perception Augs to your pool (or step up by 1 if already in your pool) and reroll all dice on a Reaction.
  • Multispectrum Vision: The die step of any Complication or Difficulty die accounting for poor visibility must exceed the Perception Augs die or the character disregards it. For any such Complication that does apply to the character, step it down by one step.

Reflex: Reflex augs reduce reaction times through increased sensory-processing speed, reduced muscle-response times, and added speed and power for transmissions through the nervous system.

  • Enhanced Fine Motor Control: Spend 1PP to ignore Complication dice applicable to a test involving dexterity.
  • Reaction Enhancement: Step up or double Reflex Augs for a test involving Initiative. Spend 1 PP to do both.
  • Synaptic Acceleration: If a pool includes Reflex Augs, you may replace two dice of an equal size with one die one step higher.

Resilience: Where Athletics Augs cover enhancements to physical endurance, Resilience Augs models systems intended to protect the body from harm, whether from toxins, disease, environmental hazards, or direct physical injury.

  • Subdermal Nanoweave: Your Resilience Aug die (or its equivalent step depending on your damage system) functions as armor against physical attacks.
  • Toxin Filters: In a test to resist toxins, whether airborne, injected, consumed, or otherwise, double or step up Resilience Augs. Spend 1 PP to do both.

Stealth: Stealth systems conceal the user from detection or from identification. This may range from lubrication of joints and the strengthening of muscles and tendons to allow for quieter movement to complex augmentations that allow the user to change the color of their skin, the length of their hair and the shape of their facial features, with various specialized components to provide various kinds of stealth.

Because of the wide variety of possible stealth functions, use of SFX or a solid description of capabilities at various dice steps is essential for this System. For example, if not using SFX: at d6, the System’s focus should be on the avoidance of detection by the senses. At d8, this expands into defenses against sensor detection and perhaps “active camouflage.” At d10, shaping of physical features and appearance becomes possible.

  • Active Camouflage: Spend 1PP to double Stealth Augs against an attempt to detect you visually or by light-spectrum-based sensors.
  • Impersonation Protocols: Step up double Stealth Augs for one scene to mimic a person for whom you have detail information about appearance, physical attributes, habits, vital signs and behaviors. Then, step down Stealth Augs by 1 step. Recover after a scene in which you do not use Stealth Augs.

The Limits of Ascension

You may want to put Limits on these Systems, either to reinforce how Augmentations work in your setting or as a sort of mechanical balance against the SFX (especially if some or all are free) attached to various systems.

Some RPGs separate out different types of augmentation—genetic engineering from cyberware or organic augmentations, for instance. If that is the case in your setting, you may want to use different Limits to represent the specific nature of the augmentations that comprise a particular System. For additional complexity, you could restrict certain SFX to certain classes of augmentation, ruling that a character must choose one Limit when first selecting that System and that, if the character wants to add an SFX that has a Limit related to a different class of augmentation, the character must have both applicable Limits added to the System. So for instance, if a character started with a “wetware”-based System, they would have the corresponding Limit. If that character’s player wanted to add a “cyberware”-based SFX, the Limit related to cyberware would have to be added to the System as well.

For a simpler approach, you could simply assign set Limits to each System, potentially using one or more Limits to offset the automatically-granted SFX associated with the System.

Digression 1
Again, the more complexity you put in this system, the more you need to think about whether the benefit of the added complexity is really worth it. As a concrete example, I started a Cortex Plus/Prime conversion for Shadowrun some time back on this blog (to which I’ll likely return). To capture the feel of Shadowrun, at least the way I’ve approached it, adds a good deal of complexity to the Cortex Prime system, taking it somewhat away from what it was intended to be. Does it end up as complex as Shadowrun? No, but it is substantially more complex than Cortex Prime, and, at that point, it may be worth thinking about whether this is the right system for a conversion, or whether so much of the complexity needs be converted into your Cortex version. With Shadowrun in particular, there already exists a simplified version of the ruleset (called Shadowrun Anarchy) that may fit the bill for you. For me, that system swung the pendulum far too far and ended up with a system that feels inadequate to account for enough complexity to capture the feel of the Shadowrun setting in a streamlined manner.

Digression 2
As best I can tell, in reality, it looks like, by the time human augmentation because truly available, augments will combine both biological and technological aspects of design into a unified whole, making the sorts of distinctions Shadowrun cares about in its treatment of Augmentation a mostly moot point. Of course, there’s a good argument that humans will resort to wearable devices for augmentation rather than surgical intervention (except in the case of prosthetics, injury or lack of natural function, of course), but that’s not quite as fun to imagine, is it? If that suits, though, this mod could be adapted to different Signature Assets to represent that reality.

With those (admittedly characteristic) digressions taken care of, here are some discussions of potential Limits to use with this mod.

Essence
Since I’ve already opened the Shadowrun can of worms, let’s start here. There are a few ways to handle Essence as a Limit. The simplest is to add the highest System die to the opposition pool of someone trying to use beneficial magic on the augmented character. For a harsher scenario, add each Augmentation die, or, like Dehumanization below, create a single Complication die based on the steps of the System dice.

Dehumanization
If you want to incorporate the idea of lost humanity as well (something I’m personally not a fan of in RPG treatments of augmentation—lookin’ at you Cyberpunk and Shadowrun), then use one of the following: (1) When the first System die reaches d10, the character gains a permanent Complication die at d6 that is added to social tests. For each additional System at D10 or increase to a d12, step up the Complication die. If the Complication die exceeds d12, the character becomes a cyberzombie. Adjust the die step at which the Complication comes into play or is stepped up to suit; or (2) Simply add any System die at d12 to the opposition on social tests.

Hackable
A few options here:

  • A character with this Limit may have Stress or Trauma to both physical and mental tracks caused by hacking attack;
  • Hacking may be used against this character to create Complications or Conditions;
  • A System with this Limit may be stepped down like an Asset or Complication through the use of hacking. You’ll need to choose a method by which the die is recovered;
  • If you have a specific Stress/Trauma track for Augmentations or being hacked, you could tie steps down or shutdown of Systems dice to that; or
  • Some combination of the above.

Complex Biology
Add the highest System die to the opposition against tests to recover or heal from damage through medical intervention.

EMP Vulnerability
This could likewise be modeled several ways:

  • EMP devices that affect this character can apply Complications or Conditions;
  • A System with this Limit may be stepped down like an Asset or Complication through exposure to electromagnetic interference. You’ll need to choose a method by which the die is recovered;
  • When exposed to electromagnetic interference, shut down this System to gain 1 PP;
  • Some combination of the above.

Conscious Activation
As written.

Glitchy/Prototype/Bleeding Edge
Convert the System die to a Complication for a roll to gain 1 PP.

Systems Stress

You may want to consider giving characters a Systems Stress Track, particularly if using rules for Stress/Trauma Tracks like those I mentioned in my series on adding grit to Cortex Prime. If you do, a few additional options may open up to you. For one, you get a way to track the condition of Systems, whether they’re affected by overuse, by hacking, by electromagnetic interference, or some other factor. If the Systems Stress Track is filled, you lose access to Systems dice. You can set up Complication/Condition dice for various stages along the Track and/or step down all Systems dice at various points along the Track, depending on the effects you want to achieve. As an additional benefit, you can allow characters to “push” their augmentations, activating associated SFX, by adding a point of Stress to the Systems Stress Track in lieu of paying a PP. In such a case, you can allow a PP to be spent as usual, or, if you want a “push your luck” sort of system with augmentations, you can require Systems Stress to be used to activate augmentation SFX. If you choose this path, you’ll have to determine how Systems Stress is recovered.

Conclusion

So there you have it, a system for handling (para)human augmentation in the Cortex System without resorting to the Powers/Abilities given in the core game. I’ve tried to include enough options in my write-up to let you fine-tune this system to suit your particular setting. I’d love to hear your thoughts on all of this, see the additional SFX you add to your lists, and generally hear about how the system works out for you if you use it!

Back to the Mud: Putting some Grit in Cortex Prime, Part II: General Difficulties

In Part I of this series, I offered some methods for modifying the core rules options in the Cortex Prime Handbook for damage and injuries to get a grittier feel. In this follow-up, I’m going to talk about some hacks for difficulty in general, because “grit” is about far more than death and dying.

As I mentioned before, Cortex Prime favors generally capable characters from the get-go and that I believe that making characters inept is the wrong way to add grit to mechanics. So we’re not going to change characters; we’re going to look at some alternative approaches to assembling pools, calculating results, and determining effects.

As a note of acknowledgment, the ideas about limiting the dice pool and the use of “Forced Dice” came from a friend of mine during a conversation we were having about adapting Cortex Prime to serve as a ruleset for my Avar Narn setting. If he gives permission, I’ll update this article to give him credit by name.

No Effect Dice, Expanded
The Cortex Prime Handbook offers a mod that removes Effect Dice from the mechanics. Unfortunately, the mod as described gives no replacement method for full degrees of effect, simply replacing all Effect Dice (where they would be used) with a d6, stepped up for a heroic success. There are plenty of games that offer varied degrees of success based on a single roll, and we could also point back to Rob Donoghue’s note about five steps stacking with the five die sizes of Cortex Prime to fill in the gap.

Rather than dividing results into “normal” successes and “heroic” successes, we can simply establish four or five sections for a granular map to convert a roll total to an Effect Die where it’s useful or necessary to do so. If you want to skip d4 Effect Dice, then you’ll have four success categories, five if you include them. I think there’s a good argument to be made for starting with d6 as the “basic” success level for mechanical ease of use, as d4’s are only supposed to be used once and then removed. On the other hand, including more d4s in dice pools increases the likelihood of Complications and Opportunities (and may further reinforce the gritty nature of a system when basic results provide only fleeting advantages).

An additional benefit for mapping mechanics to grit is that higher Effect Dice are reached less often, but this can cut both ways. It might turn many conflicts into more attrition-based slogs than the faster-moving action of the core system. A statistical analysis of the core rules for Effect Dice against the “Degree of Success” conversion described herein would need to account for many variables–average pool sizes, relative frequency of the various dice types being in pools, etc. I have neither the training nor inclination to perform such analysis for my own end systems in Cortex, much less those you might formulate for your own games. There may need to be some trial and error here.

If you’re using one of the “Damage Track” mods from Part I of this series, you can address some of this with the length of the damage track. If using weapons that add to damage inflicted, you can further tune whether weapon selection or skill rolls are most important in determining the damage of an attack. Of course, if you’re willing to make things another step of fiddly, you could have particular weapons set the thresholds between Effect Dice results (or damage inflicted) for an interesting combination of weapon and skill as factor in end result.

Personally, I’d likely skip the d4 result, starting a “basic” result at the equivalent to a d6 Effect Die, with the step of the die increased according to the following degrees: “beating” the other roll by 1 or 2 is a d6 equivalent, by 3 or 4 is a d8 equivalent, by 5 or 6 is a d10 equivalent, and by 7+ is a d12 equivalent. If you don’t mind more complexity (and more “average” results on the whole), you could increase the range of each successive step (i.e. 1 or 2 would be d6, 3-5 would be d8, 6-9 would be d10, and 10+ would be d12).

In the core rules for Conflict (or the Action-Based Resolution mod), the advantage goes to the acting character, because the reacting character must beat the acting character’s result to be successful. Many “gritty” roleplaying systems (or at least RPG systems attempting to fall into the amorphous category of “gritty”), have ties go to the defender. It’s worth considering whether to use that approach or to keep the core Cortex approach that the acting character has the advantage. I don’t think there’s a right answer here, but because this ruling applies when things are down to the wire, I expect your players will recognize the difference, even if only intuitively.

Another effect of this system is that certain “dice tricks” available with the use of Plot Points or SFX collapse into one another. For instance, the ability the add a third die to your total would now both increase your chance of success and your degree of success (whereas, under the normal rules, adding a third die to your total would make that die unavailable to be used as an Effect Die).

Limited Dice Pools
Under the core Cortex Prime rules, a character may add one die to their pool from each applicable Trait category (with some additional judgment necessary for Signature Assets and similar Traits, where having a rating within that general Trait category does not mean that it will be universally applicable). But what if they can’t? What if a character can only use a maximum of four dice in a dice pool, even if there are five Traits that might contribute a die? If this only applies to characters (players or NPCs) but not opposition rolls from other sources, this allows a great deal more fine tuning of difficulties (again, with the complexity of statistics for the Cortex Prime system, the exact steps of granularity added by such a measure is not exactly known, but we can generally surmise the difference between adding an additional d10 versus adding 2d6 to the pool–assuming we’re still only talking about using the two highest-rolling dice for the result).

To best jibe with the way the Cortex Prime system works, dice that fall outside of the character’s innate Traits should not apply to the limit–essentially, an Asset (other than a Signature Asset), an opposing character’s Complication or Condition, etc.–don’t count.

This idea also creates a new space for Traits, SFX, or Plot Point expenditures that break the rule. The ability to spend a Plot Point to add a die to the pool over the normal limit of dice should, of course, be added. Certain Trait sets, if they apply, may not count toward the dice limit for the pool–this is a great way to put added emphasis on a particular Trait set–accentuating Signature Assets, Powers, or Abilities, for instance. For a more limited version of the preceding, consider an SFX with a non-Plot-Point cost as permission to add the die to the pool regardless of the limit. I’ll be working on a post with an approach to modeling human augmentation in Cortex Prime in the near future; it will include some examples of employing these ideas for breaking the Limited Pool Rule.

This mod, I believe, also adds additional power to having higher-stepped dice in a rating. Not only does a d12 increase the total result you might reach, but it brings up the average result as well–something that you can do by adding multiple dice of a lower step when there is no limit on the pool.

“Forced Dice”
This mod works only with the Limited Pool mod above, and it’s something that I’m still wrapping my head around, so it will likely be expanded in a future post. For now, I’m just going to mention it. The idea, in general, is to create situations in which a character must accept a d4 in their (limited) dice pool. Part of determining the ultimate usefulness of this approach is finding a reason to use this method rather than the normal methods for adding disadvantages and negative conditions to the opposing pool.

Where I’m currently thinking through using this idea is where certain conditions precedent must be satisfied to undertake a particular action at full effectiveness–a character can still take the action without having first (or simultaneously) satisfied those conditions, but they must accept a “Forced Die,” a d4 added to the pool that counts toward their Pool Limit, to do so. This could be employed for taking simultaneous actions during conflict (the “multiple-action” penalty used in other games) if relevant to the way you track initiative and your action economy. It may also be used to accentuate certain conditions from the “run-of-the-mill” conditions represented by Complications.

As I mentioned at the top, I’m working on a full set of mods for Cortex Prime to run games set in Avar Narn. I’m sure there will be additional posts on this subject and others related to that ruleset on the blog soon (with the referenced post about human augmentations first among them).

Back to the Mud: Putting some Grit in Cortex Prime, Part I: Damage and Injury

Readers who’ve followed the blog for some time have likely picked up two things with regards to my favored approaches to roleplaying games. First, I prefer narratively-structured games, like Fate and Cortex Plus/Prime. Second, I like my settings gritty.

At first, these things may seem contradictory; both Fate and Cortex involve capable characters from the get-go with fairly high chances of success in their actions. They give players Fate or Plot Points to shift the narrative in their favor from time to time. I’m of the mind that this is a false dichotomy. To me, having low-powered characters with correspondingly-low chances of success is not gritty; it’s either frustrating or comical. This has been my experience with low-level characters in D&D and especially in the Warhammer (both Fantasy and 40K) percentile systems (especially when the GM thinks of unmodified roles as “easy” ones instead of following the rules guidelines that “easy” rolls should give bonuses–this is easy to forget in the thick of the game). To me, a gritty setting is one in which the characters are capable, but even skilled characters can get unlucky and suffer extreme consequences. It doesn’t happen often, but even an untrained peasant with a pitchfork can kill an armored knight when the chips fall just so. This is where, as with real life, skill alone is not always enough to prevail.

Philosophy of gaming (were that an established academic field!) aside, this post is going to be about adding some mechanical elements to Cortex Prime to increase the grittiness of the system. As one last note within this preamble, I want to point out that no mechanical changes are strictly necessary to run a gritty game of Cortex Prime–simply narrating the action to fit the feel of the game can accomplish this. But, for those who want to go further, to adapt Cortex Prime from a “generic” system to one that can be tailored to genre and tone, here we go.

In this post, we’ll talk about some ways to use the rules mods given in the Cortex Prime Handbook (sometimes with small changes) to adjust grittiness. In the next, I’ll offer some ideas that diverge more significantly from the mods contained in the Cortex Prime Handbook.

Being Taken Out
On my first readthrough of the rulebook, it struck me that the Stress and Trauma system suits a gritty setting best. Subsequent thought revealed that I may just be partial to that system because it feels a little more like “traditional” RPGs without going fully to the “Ablative Hit Points” mod. Reflection has led me to the thought that the basic rules for being taken out (spend a Plot Point to not be taken out of the scene) may be used to bring heightened tension to conflict that matches with a gritty feel. The key here is in addressing the consequence here suffered upon being taken out. For more cinematic games, the Consequence suffered for avoiding being taken out can be narratively (but not mechanically) lower–getting winded, winged by a bullet or otherwise put in a position that complicates things without being in real physical jeopardy. Conversely, these Consequences can be made more narratively significant without modifying the mechanics: if the character suffers a Consequence because of a gunshot, then the Consequence could be Sucking Chest Wound d10 or Gutshot d8. Even if no mechanics are altered, this will certainly put players on edge more than Flesh Wound d8. Of course, I’m not just going to suggest narrative changes here. My main point here is that, with regard to the base system for conflict, staying in the fight creates an additional pull on resources (in the form of Plot Points). Tough choices regarding resources is a core of mechanically-gritty systems–this naturally increases the dramatic and tactical strain on both characters and their players. Consider using the “core” system for being taken out with other rules systems to drive home risk and a need for resource conservation.

Stress and Trauma to Lethal and Non-lethal Damage
One alternative to the core system for being taken out of a conflict presented in Cortex Prime is the system for Stress and Trauma. Under that system, a character first takes Stress as a Complication to an attribute when losing a test in a confrontation. If the character has d12 Stress, this is converted into Trauma, which has the same mechanical complication as a Stress Complication but which is more slowly recovered. A character who takes “damage” that would push Trauma beyond d12 is removed from the game, probably because the character dies in the case of Physical Trauma (or is mortally wounded, put in a coma, etc.).

One simple shift in thinking here is to draw upon the World of Darkness/Storyteller damage system, thinking not in terms of Stress and Trauma but lethal and non-lethal damage. To be specific, replace Stress with Non-Lethal Damage and Trauma with Lethal Damage as with the original system, once Non-Lethal Damage is at d12, further Non-Lethal steps of damage are added to Lethal Damage. But where circumstances indicate the damage received would be life-threatening (the use of weapons, a fall from a height, fire, electricity, etc.), apply the damage to the Lethal Damage die, skipping over the Non-Lethal Damage die altogether. This would work well in systems where brawls (fisticuffs being treated as Non-Lethal Damage under the logic that punches and kicks can be deadly, but it usually takes more than, say, hitting someone with a hammer, to push from bruises to serious injury) are more common than deadly fights, or where the consequence of producing a weapon should be dramatically significant. This can easily be combined with the core Being Taken Out system to make conflict (especially physical conflict) an extremely serious event rather than a common and expected aspect of the game, suiting this especially to investigative or political genres.

A further question to be answered if using this system is how to apply the Complications of Non-lethal and Lethal damage. Do you apply both dice to the opposition test, only the higher of the two, or use some other method to determine effect on rolls?

For an additional complexity, you can allow appropriate armor to convert Lethal damage into Non-Lethal damage based on the armor’s step/rating. This gives characters some added protection without armor having the ability to completely nullify the effects of an injury.

Recovery Times
As the Dungeon Master’s Guide attempts to do in D&D, making things feel gritter may be a matter of increasing recovery times. As the various implementations of extended rest rules in D&D indicate, however, extending recovery times fails if it is the sole method of making a game “gritty.” If injured characters can still meaningfully participate in the style of game being played as they recover, then extended recovery rules may work well. If they only make it necessary to “fast forward” for weeks or months as characters recover, this doesn’t really provide you with any benefit.

If it fits–say one of the features of your particular game is that the characters’ situation gradually worsens until they manage to snatch victory from the jaws of defeat at the very last moment (which, if you believe the gaming philosophy espoused by John Wick in his Play Dirty books–controversies about his behavior as a person and RPG developer aside–is what players really want), then you might be served by extending recovery times. Unless truly necessary, though, it’s probably best to continue keeping recovery abstract without adding too many additional recovery rules. Consider having Stress (or its equivalent) recover between each session and Trauma (again, or its equivalent) recover between adventures. This provides dramatic increase in the tolls taken on characters as a story progresses without bogging things down. Combine with a Doom or Crisis Pool mechanic and you end up with a serious spiral of stakes.

To my mind, as a matter of game design, the best place for extended (or “realistic”) recovery times is in settings where some form of “miraculous” healing exists to circumvent normal recovery times, whether magical or technological. This bears in mind the realism of injuries while allowing characters to return to full status in a more player-satisfactory time frame. The only time the rule really matters, then, is when the players do not have access to such super-healing, allowing for an occasional point of higher stakes and drama if used sparingly.

“Ablative Hit Points” and the Condition Monitor
Above, I mentioned drawing inspiration from the WoD/Storyteller system for rethinking Stress and Trauma. Here, I’ll make reference to Shadowrun‘s “Condition Monitor” as a way for modifying the “Ablative Hit Points” system given in Cortex Prime.

Shadowrun calculates damage in “boxes” inflicted on a character’s “Condition Monitor.” A character has two Condition Monitors, really–one for “Stun” damage and one for “Lethal” damage. Each track typically has ten boxes, but this may be modified by a characters attributes, cyberware and other traits. As with Stress and Trauma in Cortex, “Stun” spills into Trauma when the Stun track is full. Where the Condition Monitor approach provides inspiration for Cortex is that it spaces out the mechanical penalties suffered for injury along the track (in more recent editions, cyberware or other factors can modify exactly where on the tracks these penalties are situated).

We can add a similar idea to Ablative Hit Points, assigning Consequence Dice to various segments of the Ablative Hit Points total. If you start with 10 “Hit Points,” perhaps a d6 Consequence is suffered when your remaining total reaches 7 Hit Points. This combines the “pacing” mechanic of Hit Points with more discrete and immediate effects. As with Shadowrun, and the Lethal/Non-Lethal damage system above, you could maintain two tracks, with excess “Stun” or non-lethal damage spilling into the Lethal category as it does in Shadowrun. If you use two tracks, you again need to decide whether penalties from the two tracks stack (or if only the Lethal track has penalties at all, which might allow a middle-ground between the cinematic and realistic).

To combine ideas from Shadowrun and World of Darkness, you could use a single track for both Non-Lethal and Lethal damage. To do this, Non-Lethal and Lethal damage are notated differently on the track (WoD used “/” and “X” to fill boxes). If the track is full and additional Non-Lethal damage is received, any Non-Lethal damage marked on the track is converted to Lethal damage before any points “overflow” into the condition that occurs (whatever that may be) when damage is received beyond a full track.

The number of Hit Points a character has is an important consideration. Thinking in terms of Dice Steps to numbers (see Rob Donoghue’s post on Evil Hat Games) mapping onto a 1-5 system (as in Fate), if you’re using an Effect Die, a maximum of 5 Hit Points of damage may be done with a single attack, perhaps one or two more if you use heroic successes for stepping up. The major consideration here is whether you want the possibility that a (player) character can be killed in one attack (depending on what having 0 Hit Points means). Additional considerations include how much damage can characters suffer overall and what is the hit point recovery rate.

If you want the additional mechanics, or a shift more toward the “traditional” RPG feel, you can add damage values for weapons (which should be a factor in determining the length of your damage tracks). Likewise, you can have armor prevent damage altogether, convert lethal damage to non-lethal damage, or some combination thereof. This shifts away from the core philosophy of Cortex Prime by moving toward a stricter accounting for gear and equipment, but if such a move suits your game, why worry about that at all?