Your magical energies cling to enemies, interfering with their spellcasting.
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) for 1 round. Targets that avoid the spell’s effects avoid this feat’s effect as well.
A disruptive spell uses up a spell slot one level higher than the spell’s actual level.
The text on this page is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.
Sources:
SECTION 15