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[Nihility]

I really hope you're not a healer, because that kind of thinking is what gets people killed.

Damage mitigation is never wasted. It's either cures which don't need to be used later or a hitpoint buffer if they're attacked with a big hitter. I've seen plenty of DPS get hit by the bosses big skills (mostly melee) and stoneskin can be the difference between them dying or surviving the assault.

I am a healer that's been killing twintania for over 10 weeks straight with no problems and clear all 3 extremes each week as well
stoneskin has plenty of great uses but buffering anyone but the tank with it before fights is mostly a waste of time