Type: Metamagic
Source: Champions of Ruin
Your spell releases residual eldritch power that entangles your enemies.
Benefit: The feat can be applied to any instantaneous spell that deals acid, cold, electricity, fire, or sonic damage, such as fireball or lightning bolt. After the spell is cast, lingering tendrils of raw energy persist; creatures damaged by the spell are entangled for 1 round. The spell is considered to be in effect during this time and can be dispelled normally. An entangling spell uses up a spell slot two levels higher than the spell's actual level.