Crescendo

Close-quarters spell
At-Will
Special: 

You can choose more than one target for this spell, but you take a –2 penalty when attacking two targets, a –3 penalty for three targets, and so on.

Target: 
One or more enemies engaged with you (but see below)
Attack: 
Intelligence + Level vs. PD
Hit: 
4d6 thunder damage, and the target pops free from you.
Miss: 
Damage equal to your level.
5th Level Spell: 
4d12 damage.
7th Level Spell: 
7d10 damage.
9th Level Spell: 
10d12 damage.