You need to break concentration, I rather like that mechanic. The best spell I `found` in this game bar none, is Magic Missile.
Enemy casters need to save for concentration on *every* missile hit. It's also the only spell that *always* hits and so far nothing I've seen so far [early act 3] is immune to it. It's even good against doors.
Defending against it - Counterspell is king. I made Gale a Lucky Diviner with Counterspell. Magic doesn't come near. He could only be better at it if he were a halfling.
