Quote Originally Posted by Eladrin View Post

-20 for 15 seconds, -18 for 15 seconds, -16 for 15 seconds, and so on.


I disagree - if you fail to kill something, then with a long cooldown you simply cannot try again. With a debuff, you can try again, and then you can choose whether or not you want to cast the spell on another target or wait for the debuff to drop. It's much more lenient than a lengthened cooldown.
So the debuff does act like a seperate event per mob. A good wail however will knock a pm out for about a minute. There still needs to be a hard cap.

I walk into a room of 10 mobs, wail and kill 8. On normal even this would drop my dc to a 30 and I wouldn't be able to FoD effectively for 60 seconds - at a dc of 38. Seems a bit harsh though I like the principal. The timer needs to be reduced to 10 seconds or less per tickoff.