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Old 01-11-2010, 08:37 PM   #1
Nolinquisitor
 
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Location: Québec City
Default Limitation: Requires (Skill) Roll?

I was thinking about making a power which results would be dependent on a skill roll. Okay, easy enough. Take GURPS Powers limitation Requires (Attributes) Roll and voilà. Unless, I want to make the result more effective with a more successful roll.

For exemple, let's take a generic Magic Blast 5 (Requires Magic Roll; -??%) [??]. I would like the use to use 1d of damage on a success roll, 2d for a success by 1, 3d on a success by 2, etc.

Then, for a less powerful version of this power, it could be 1d for a success by 0 or 1, then 2d for a success by 2 or 3, etc.

How much would you charge for the first version, -10%? And for the second, -20%?
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Old 01-11-2010, 08:42 PM   #2
PK
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Default Re: Limitation: Requires (Skill) Roll?

This can be handled with a not-quite-official limitation of mine that you can find tucked away in Pyramid #3/9. Warning: It's complicated as all hell, which is why I don't plan on ever trying to squeeze it into a book -- instead, I use it as the basis for other, simpler limitations (such as the one found on Mental Stab in GURPS Psionic Powers).
Limited by Margin (Varies)

Your advantage does not always take effect at full
power; it depends on your margin of success (or margin of
victory, for a resisted ability). Its value is -5% times the
required margin of success (minimum 2, maximum 10) for
full power; lesser margins give you proportionately less
power.

In other words, for -10%, your ability works at full
strength if you succeed by 2+, or half strength if you succeed
by 0 or 1. For -15%, you have full power with a margin
of 3+, 2/3 power with a margin of 2, and 1/3 power with
a margin of 0 or 1. For -35%, you have full effect if you succeed
by 7+, 6/7 if by 6, 5/7 if by 5, and so on, down to 1/7
for a margin of 0 or 1. Obviously, this limitation is far simpler
in play if you match the required margin of success to
the level (or an exact fraction of the level) of the advantage.

Example: Zzap has Burning Attack 12d (Limited by
Margin 6, -30%) [42]. If he shoots someone, his laser does
2d burning damage for every point by which he makes his
attack roll, to a maximum of 12d (with a margin of success
of 6 or more). His opponent’s defense roll doesn’t
affect this.

He later wants to buy the limitation down to Limited by
Margin 5 (-25%), but the GM threatens to cut off his soda
privileges if he does that, because it doesn’t divide evenly
(and fractional dice are no fun). So he instead earns more
character points and buys it down to Limited by Margin 4
(-20%), and now he does 3d burning damage per point of
success (now hitting his 12d maximum if he succeeds by 4
or more).
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Old 01-11-2010, 08:44 PM   #3
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Default Re: Limitation: Requires (Skill) Roll?

Quote:
Originally Posted by Nolinquisitor View Post
I was thinking about making a power which results would be dependent on a skill roll. Okay, easy enough. Take GURPS Powers limitation Requires (Attributes) Roll and voilà. Unless, I want to make the result more effective with a more successful roll.

For exemple, let's take a generic Magic Blast 5 (Requires Magic Roll; -??%) [??]. I would like the use to use 1d of damage on a success roll, 2d for a success by 1, 3d on a success by 2, etc.

Then, for a less powerful version of this power, it could be 1d for a success by 0 or 1, then 2d for a success by 2 or 3, etc.

How much would you charge for the first version, -10%? And for the second, -20%?
So, to be more specific, the first version would be Limited By Margin 5 (-25%) while the second would be Limited By Margin 10 (-50%).
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MyGURPS: My house rules and GURPS resources.

#SJGamesLive: I answered questions about GURPS After the End and more!
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Old 01-11-2010, 08:55 PM   #4
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Default Re: Limitation: Requires (Skill) Roll?

"Its value is -5% times the required margin of success (minimum 2, maximum 10) for full power; lesser margins give you proportionately less power."

Yes, exactly like that. That's a nice way to put it. This "Result Dependent" limitation seems to model what I have in mind. Now I have to decide what to to with Critical results.

Thanks for the semi-official take on it. :)
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Old 01-12-2010, 06:13 AM   #5
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Default Re: Limitation: Requires (Skill) Roll?

Quote:
Originally Posted by Rev. Pee Kitty View Post
...
Limited by Margin (Varies)
...
LOVE THIS! Especially as it applies to Magery by Powers!

Nymdok
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Old 01-12-2010, 11:45 AM   #6
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Default Re: Limitation: Requires (Skill) Roll?

Quote:
Originally Posted by Rev. Pee Kitty View Post
Limited by Margin (Varies)
Rev. Pee Kitty, have we told you, lately, how much we love you?

For what it's worth, I think the rule is worthy of inclusion into GURPS canon.
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Old 05-25-2016, 10:55 AM   #7
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Default Re: Limitation: Requires (Skill) Roll?

A couple of years late to the party, but man, that's the best compliment ever.

For GURPS!
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Old 05-25-2016, 01:23 PM   #8
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Default Re: Limitation: Requires (Skill) Roll?

Quote:
Originally Posted by Nolinquisitor View Post
A couple of years late to the party, but man, that's the best compliment ever.

For GURPS!
<MOD>

I appreciate the enthusiasm, but do please take a moment to skim the forum rules. We ask that ancient threads be resurrected only when you're adding meaningful content to them. It's not a huge deal and you aren't in trouble here; I just want you to be aware of that and keep it in mind. Thanks!

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MyGURPS: My house rules and GURPS resources.

#SJGamesLive: I answered questions about GURPS After the End and more!
{Watch Video} - {Read Transcript}
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