Mitigating Disadvantages w/o Self Control Number

[Captain Joy]

Originally Posted by Eukie

Self-control rolls are against 6, 9, 12, and 15. We can extend this sequence to cover the range 0-3-6-9-12-15-18-21 with each step costing 50% of the base cost. Hence, rolling against a self-control number of 18 is worth 0 points, while the guaranteed failure of rolling less than 0 is worth x3 the usual cost.

If a disadvantage applies all the time, you might then assume that it has a self-control number of 0, and an effective triple cost. If it gave 30 points, giving it a self-control number of 12 would reduce it's value to 10 points.

I get want you're saying, but since a 3, 4, 17, and 18 are automatics or criticals, maybe the effective sequence is closer to never-6-9-12-15-always.

Originally Posted by Bruno

GURPS Zombies adds a "Constantly" level to self control, which gives you the baseline point cost for an always-on mental disad that you can then back-form the price for a 12-minus Self Control version to apply Self Control modifiers to normally. Spoiler: it'll end up pretty cheap compared to the always-on version, potentially approaching the quirk but with more complicated mechanics.

Disadvantages With A Self-Control Number

• You resist never (N/A – 0% of the time): 2.5 x listed cost. (GURPS Zombies, p. 60)
• You resist quite rarely (roll of 6 or less – 9.3% of the time): 2 x listed cost. (B121)
• You resist fairly often (roll of 9 or less – 37.5% of the time): 1.5 x listed cost. (B121)
• You resist quite often (roll of 12 or less – 74.1% of the time): 1 x listed cost. (B121)
• You resist almost all the time (roll of 15 or less – 95.4% of the time): 0.5 x listed cost. (B121)
• You resist always (100% of the time): 0 cost. (obviously)

So Zombies added the 2.5 x cost mechanic to Disadvantages in order to make resistible mental Disadvantages not resistible. Why not apply the same metric to not resistible mental Disadvantages to give them a Self-Control number? Seriously, I'm asking; if this is not a good idea, let me know why.

Disadvantages Without A Self-Control Number

• You resist never (N/A – 0% of the time): 1 x listed cost.
• You resist quite rarely (roll of 6 or less – 9.3% of the time): 0.8 x listed cost.
• You resist fairly often (roll of 9 or less – 37.5% of the time): 0.6 x listed cost.
• You resist quite often (roll of 12 or less – 74.1% of the time): 0.4 x listed cost.
• You resist almost all the time (roll of 15 or less – 95.4% of the time): 0.2 x listed cost.
• You resist always (100% of the time): 0 cost. (common sense)