Ward cumulativity

[Chazar]

Oh, I should mention that while multiplying resistances is easy percentage math, modelling susceptibility still offers some choice:

1. We turn all percentages x% into a float via ((100-x)/100) and multiply them up to gain the resulting factor to apply to the resistable damage value.
This works as it does now: 25% resistance reduces the resistable damage by a quarter, while 25% susceptibility (= -25% resistance) adds another quarter to the damage. Yet unlike now, both do not cancel each other out: 0.75 * 1.25 = 0.9375, so resistance always outweighs susceptibility somewhat. This is natural percentage-math, and one might want it that way, but maybe some players might find it counterintuitive. On the other hand, having two resistances of 20% and 30% do not yield a total of 50% resistance anyway now (which is intended here after all!), so one would not expect 50% susceptibility to be cancelled out by them anyway (0,7*0,8*1,5=0,56*1,5=0,84)...

2. Another sensible way to model susceptibility might be the following: model susceptibility by taking the reciprocal value of the resistance factor, i.e. (100/(100-x)). So now a total of x% suceptibility exactly cancels out a total of x% resistance. But the percentage would then mean something different for susceptibility as compared to now:
20-point susceptibility adds +25%damage,
25-point susceptibility adds +33%damage,
33-point susceptibility adds +50%damage,
50-point susceptibility adds +100%damage,
100-point susceptibility means immediate death upon a single point of that damage (consider a petroleum-based-elemental getting struck by a fire dart). (Maybe as a side-effect this mechanism could also be used to model weapons like the ethereal crossbow or elf bane).
Note that this is sensible: 100% resistance make a creature totally immuny, so 100% susceptibility ought to make a creature totally vulnerable to that energy type! So I would prefer the latter model, although it turns suceptibility numbers into something other than percentage values.


I just wanted to point these simple things out - it's not the math that is difficult here, it's the mathematic modelling that matters!