wThere was some discussion floating around (mainly on Blight I think), but I just wanted to clear this up (wasn't sure where to pop this but here goes)...
I'm pretty sure this passive ability IS currently working as intended, atleast on Chaos. The description only mentions spells, not abilities, and I've been hunting some Shadow Spiders (OT: for the purpose of making the Group Cure Poison) and as far as I can tell, it removes the appropriate 10% off all spell timers.
For example, I cast a 5min timer spell, and sure enough, it starts to count down from 4:30. And if I cast a 1 min timer spell, it'll start from 54secs. I've tried both healing, damage spells and debuffs. So just wanted to say, it IS working, so please don't stuff around with it
On a side note: Is it possible to have those Cure Poison spells work on other Poisons aswell?