3e-style Psionics using 4e-style tools
 

In this thread, I intend to rough out a primarily skill-based take on psionics, using 3e’s Psionics as inspiration but with a more open-ended and customizable approach. Basic concepts:

1. Either the “Magical Scope Parameters” from GURPS Thaumatology or the Effect Modifiers from Ritual Path Magic will be used in determining what a “psychic skill” can do. How they’re applied is described below, though it’s still subject to change.
   
   
2. Each “psychic power” has a Potency advantage which comes in levels and is priced according to how broad or narrow the power is, just like how Power Talents work in GURPS Powers — except that Potency doesn’t normally add to any dice rolls (its use will be detailed shortly). The cost per level still needs to be determined; but I suspect that 5, 10, or 15 points per level would be too cheap. My gut instinct is 10, 20, or 30 points per level; but I haven’t done any playtesting to verify or disprove this. (EDIT: vierasmarius has convinced me that the only fair pricing would be 5, 10, or 15 points per level.)
   
   The Potency advantage also takes a “power modifier” as per GURPS Powers, allowing this system to quickly and easily be adapted for use as chi skills, divine miracles, magic spells, spiritual rituals, etc. I’m just using the “Psionic” modifier as a working example.
   
   “Potency 0” is effectively an Unusual Background; and as such, it may have a cost as low as zero points. Note that the option from Thaumatology about allowing spellcasting without Magery at a -5 penalty can be adapted to Potence: if this option is in effect (say, for worlds where “all humans are latent psychics”), anyone can learn psychic skills; but they suffer a -5 penalty if they don’t have at least Potency 0.
   
   
3. Every psychic skill defines a Primary Parameter from the aforementioned Scope Parameters. The effective rating of the Primary Parameter equals the rating of the associated Potency attribute plus the skill roll’s margin of success.
   
   
4. The skill can have any number of Secondary Parameters, as long as the parameter in question makes sense for he psychic phenomenon that the skill represents. These Secondary Parameters start at zero by default, and can be raised as high as the associated Potency trait by taking a skill penalty at a one-for-one exchange rate; each Secondary Parameter’s skill penalty can be bought off as a Technique.
   
   If you wish, you can apply some or all of your margin of success to a Secondary Parameter, or even split it up among several Secondary Parameters. Ignore the Potency cap when doing so.
   
   It’s also possible that a given skill might need a Secondary Parameter with a non-zero default rating. If this is the case, the skill has a minimum Potency prerequisite, at least equal to the highest non-zero Secondary Parameter and probably higher (though how much higher, I’m not sure yet).
   
   
5. Prerequisites are rare. In general, if being able to do X implies the ability to do Y, then Y defaults to X at some penalty rather than X having Y as a prerequisite.
   
   
6. Skill difficulty is a reflection of its “complexity”, as the term is defined in the New Invention rules: Simple skills are Easy, Average skills are Average, Complex skills are Hard, and Amazing skills are Very Hard. Yes, this requires a GM judgment call; advice on how to judge it should be provided. Conversely, this provides a basis for using the Invention rules to develop new skills.
   
   
7. psychic abilities that don’t involve skill rolls can be added as Perks. They follow the same rules as outlined above, except that there’s no “margin of success” benefit due to there not being any margin of success to benefit from.
   
   Perks might seem to be a little cheap; but bear in mind that if they can do a lot, it’s because they’re coupled to a Potency advantage. Compared to the skills, the perks are very reliable in that you don’t have to worry about failure; but you also don’t get the benefits that come from beating the target number by a substantial margin. A case could be made that they should be cheap Advantages rather than Perks; but I wouldn’t price them any higher than 5 points each — slightly more than the cost of buying a Hard skill at no penalty.
   
   
8. In general, most of the special rules that Powers provides for customizing its powers (e.g., Extra Effort rules) can be applied to this system with little to no modification. Likewise, some options available in Thaumatology (such as the Ritual Magic option) could be applied to this to further customize it — though you’d need to watch out for unintended consequences, such as the switch from Skills to Techniques clashing with the buying off of Secondary Parameter penalties as Techniques.

That’s about as far as I’ve gotten. Comments and criticisms welcome; suggestions and advice especially welcome.

Re: 3e-style Psionics using 4e-style tools
 

I liked it, was about to go to bed when I saw this and thought it was a gem!

In sum, ill refrain from giving further feedback as im sleepy and havent read it all, but I loved at first glance and will post more later on the week.

Re: 3e-style Psionics using 4e-style tools
 

I like what you've got so far. I now definitely see what you meant by a Skills + Advantages approach that's different from the existing 4e Psionics Powers.

I do have one concern about how skills and Potency interact. The effectiveness of a psychic skill is based on the Margin of Success, with Potency adding directly to that margin. In effect, Potency is a limited Talent, but you've priced it at twice what a Talent would be. This may encourage players to just pump up skill (if there aren't many per category) or IQ instead.

Personally, I'd lessen the impact of skill, so people who want raw power buy more Potency. Skill should be used for finesse - precise control, special techniques, etc. Maybe they can sacrifice skill to gain power, but it should be draining (higher FP cost?) and not overall as efficient as having higher Potency to start with.

Re: 3e-style Psionics using 4e-style tools
 

Note that +1 to skill does not equate to +1 margin of success, unless you’ve pretty much maxed out the skill: the average margin of success at skill level 10 (assuming success) is 23/12; the average margin of success at skill level 11 (again, assuming a success) is 28/12. So buying a +1 to your skill at that level gives you slightly less than a half-point (5/12, to be exact) increase in your margin of success, assuming you succeed. As your skill gets higher and success gets more likely, this rate increases, until it approaches one; but it never quite gets there.

But you raise a good point: unless I jimmy the system so that margin of success has less of an impact than Potency does, I probably shouldn’t price Potency any higher than an equivalent Talent would cost. So 5, 10, or 15 points per level of Potency. Keeping it from getting out of hand is a function of setting up the progressions of the Parameters as something reasonable.

Note also that I haven’t said anything about what the FP costs are. That’s because there may not be any: I’m debating the possibility that FP costs come from incorporating “Costs FP” into the Power Modifier. Likewise, incorporating Requires Preparation into the Power Modifier might result in lengthy rituals a la Path Magic instead of the “concentrate for a second or two” model that one expects from Magic and 3e Psionics. And so on. That said, this is still very much in the brainstorming stage.

And then there’s the possibility of applying the Extra Effort rules to Potency to exceed its usual limits…

Re: 3e-style Psionics using 4e-style tools
 

Of course, higher skill also raises your chance of success - quite significantly, at skill 10-11. If you've only got a 50% chance of success, an ability that gives +1 MoS is only adding that to half the rolls, because the other half fail outright.

Personally, I'd handle all increases to Potency in a manner like this, though with variations to the standard Extra Effort model. Perhaps have a fixed -2 skill penalty per +1 Potency instead of the usual -1 per 10% increase, and 1 FP per +1 instead of a flat 2 FP per attempt. Or have a higher skill penalty but the option to spend FP to counter the penalty.

Anyways, that's just my preference, to fit my view of fictional psions. It remains to be seen how any of this actually functions in play.

Re: 3e-style Psionics using 4e-style tools
 

True enough. That seems fair, though: a fractional increase in your margin of success if you succeed plus an improved chance of success on the one hand, or a full point improvement if you succeed but without the improved chance of success on the other hand. Yeah; I’m comfortable with them both having the same cost.



I’ll be reviewing the Extra Effort rules shortly.

Re: 3e-style Psionics using 4e-style tools
 

I think your math is off. If you have two characters, one with skill 11, one with skill 10 and a +1 to MoS, they will have the same MoS for the same dice rolls, with only one exception: The skill 11 character will succeed on a roll of 11, with MoS 0, while the skill 10+1 character will fail on a roll of 11. On a roll of 10 they'll both have MoS 1. Also, if Margin of Failure matters the skill 11 character is even better off, since when he fails it will be by one point less.

Re: 3e-style Psionics using 4e-style tools
 

I prefer 4e over 3e and had fun converting a character to it. Really thinking of what was 3e's bargain basement to a focused 4e of what is it going to be.

Re: 3e-style Psionics using 4e-style tools
 

I don’t want this thread to turn into an advocacy war; so I’ll just say that I liked 3e’s approach of an Advantage that defines how much you can do and a set of skills that define what sorts of things you can do with it — and it’s that approach that I’m seeking to emulate here.

If you prefer 4e’s approach over 3e’s approach and don’t see any way for 4e to have room for both, have fun with Powers as written; this thread probably isn’t for you, as I’m attempting to do something that isn’t GURPS Powers.

Re: 3e-style Psionics using 4e-style tools
 

Why not simply transcribing the 3e system to 4e and fixing it where it breaks down ?

I liked Power levels costing different ammounts for different powers (esp cheaper than pk or telepathy for instance), I also liked how some power thresholds allowed access to cool habilities (like combat sense).

Re: 3e-style Psionics using 4e-style tools
 

That will get you a functional psionics system; but that’s all it will get you. I’m trying for something a little more ambitious than that.

Re: 3e-style Psionics using 4e-style tools
 

No psionic system will be perfect unless its perfectly suited for the setting, something that is completely dependant on setting assumptions and therefore even a more ambitous system will break down if its not operating under the same assumptions.

In sum, when making a system to be generalized, I tend to be ambitious only when it concerns to adapting a system to my campaign world. Otherwise ill be constantly reinventing the wheel.

Re: 3e-style Psionics using 4e-style tools
 

The key lies in making it adaptable.

Re: 3e-style Psionics using 4e-style tools
 

I don't follow this point. If Y is truly a prereq, then it's necessary to know Y well, as it's fundamental to doing X, or even a subcomponent. It doesn't make sense to default a prereq from the main skill. For instance, if Algebra is a prereq of Calculus, you don't just study calculus and somehow get Algebra = Calculus - 4 as a side effect. You'd have to learn enough Algebra first to even learn Calculus. Prereqs should be either a minimum enabling level for later skills, or perhaps might cap the dependent skills.

If Y isn't truly a prereq, but some other related application of the power, then X and Y are separate skills. TK Punch doesn't really help TK Lockpicking, no matter how good at punching you get.

If the skills are closely related but not really a prereq, they'd be Techniques of some common base skill. Campfire and Fireball might both be Techniques of Create Fire (or Pyrokinesis, if you prefer). (The degenerate case here is naming one of the Techniques the same as the base skill, which is why I avoided calling them "Create Fire" and "Fireball".) This method will be analogous to Ritual Magic, with some number of specialized skills based on some core, with likely several core skills matching the base power Advantages.

Re: 3e-style Psionics using 4e-style tools
 

Perhaps it would help us understand your system better if you can give examples of a psychic skill set, the Potency advantage involved, and how that translates into performing psychic feats. For example, the Telekinesis set could have Lift, Levitate, Deflect, Throw, all governed by TK Potency [X/lv]. Lift takes a modifier for the weight of object moved, the distance to the target, speed of motion, etc.

Re: 3e-style Psionics using 4e-style tools
 

Using absolutely no actual term of Psionics, I'm going to see if I understand this correctly, because your ideas from another thread intrigue me;

Foo_Ad is the potency advantage. It is worth X pts per level. What really hugely matters here is if the trait is exponential, logarithmic, or flat increases.

Foo_Skill1 is an example skill. It is priced exactly as a normal skill and is merely here to act as a skill. It describes something you can already do due to Foo_Ad. It is nothing more than Climbing or Acrobatics; something a normal person could do with or without any points in it.

Reading your OP, it sounds like Foo_Ad might also be a bad talent. I don't think it should in anyway affect the skill. It's literally there to be your 'ST'.

Buying Foo_Ad at level 1 and Foo_Skill1 at IQ+10 gives us a weak and narrow but precise character. Buying Foo_Ad at lvl10 and Foo_Skill1 at IQ-1 gives us a powerful but narrow and hard to control power. To branch out, you'd either get more skills or advantages.

Since Foo_Ad isn't really a talent but ST for purposes of whatever skills it offers, then all we have to do is figure out which each level gives us.

Now to look at actual psionic abilities, Psychokinesis is quite broad. In Psionic Powers, it points out you need a minimum 31 points to have it all, not including the side powers you can add on. That pushes the value of the first level up to 40 or even 50 pts. Mind, some traits don't line up well with levels properly, and some aren't openended, making high levels less useful or putting a cap on how many you can buy. I'd call it roughly 40pts/lvl (and make that the maximum, maybe ESP and Teleportation are worth that much).

So, making each level of Potency 20, 30, or 40pts sounds fair (with a note on limitations for having only one power or a few of the trait, such that some can give a -80%). Then just describe what each level gets you. The first level is somewhere around 1d of damage, a BL of 0.2, a range of X, etc.

Separate from all that, there can be Talents or Wildcard skills that encompass the skills you get. As for skill difficulty itself, I like the idea.

Re: 3e-style Psionics using 4e-style tools
 

More or less, yes. My “Potency 0” notes are there to potentially blur the line a bit, by suggesting a (minor) variant where Potency isn’t strictly necessary. But yes; in theory, Potency is what enables everything to work, while the Skills (and Perks) “merely” denote which uses of the Potency you’ve figured out. And yes; the progression of the various Parameters is what’s going to make or break this system.

I think it’s worth noting that despite Potency not adding to the skills, it serves a role very similar to Magery; and as such, should be customizable in many of the same ways.

Essentially true. In practice, I like the notion that particularly skilled use of your power lets you eke out a more effective result, which is where the “margin of success” business comes into play; but that has the unintended consequence of giving you a means of comparing Talents to Potency. So maybe I should drop that and just go with the notion that a Critical Success gives you something extra.

…and this is where the Magical Scope Parameters or Effect Modifiers from Thaumatology and Ritual Path Magic factor in: they, or something like them, tell you what each level of Potency gives you.

Yes. You also have the option to switch to the Ritual Magic learning scheme for the skills, with a single core skill (e.g., Thaumatology or Ritual Path Magic), one or more Path skills, and individual uses of the power as Techniques.