Is Mass Charm Balanced?

[Victim]

And vice-versa, to be sure. I can think of lots of monster powers that I would love my characters to have. Really nice ones out there.

Yeah, a lot of monsters have save ends conditions on their basic attacks, for instance.

 

[mudlock]

If it required an attack vs will I'd definitely consider other alternative spells

If it required an attack vs. will, it'd be Decree of Khirad; a level one Warlock daily.

You should expect level 17 encounter powers to be better than level 1 dailies. (Examples left as an exercise to the reader; conditions may vary; offer not available on Sleep.)