Quote Originally Posted by pandabearcat View Post
Furthermore, I am unsure of the actual damage contribution of Disembowel. Is 10% piercing resist reduction 10% damage increase? It seems like it would not be that simple.
It is that simple. On the backend they could just make it a 10% buff or they could do it more circuitously as:

damage buff = (200 - (damage type resistance))/100

Either way, I've tested it on NIN and DRG as being 10% and definitely not 11.1% (using Aeolian Edge and Full Thrust to really exaggerate the difference).

I've heard anecdotally that Shiva's debuffs (which really do drop your resistance stat) suggest it works the more complicated way.