DISRUPTIVE SPELL [Metamagic]

     Your magical energies cling to enemies, interfering with their spellcasting.

Benefit: Targets affected by a disruptive spell must make concentration checks when using spells or spell-like abilities (DC equals the save DC of the disruptive spell plus the level of the spell being cast) until the end of the target's next round. Targets that avoid the spell’s effects avoid this feat’s effect as well.

Level Increase: +1 (a disruptive spell uses up a spell slot one level higher than the spell’s actual level.)