Yeah trying doing them more than 2 times on mobs without killing them in mere seconds, or see if they work on bosses. Cause they don't.

It doesn't matter how much you stack of it either.

One you'll gimp your overall damage.

Two, the first cast is the only effective cast, all others after the first are less effective.

Sleepga is the only worthwhile enfeeble and after 2 casts, mobs will become immune.