Your angelic heritage allows your spells to operate on a higher plane of existence.
Benefit: A number of times per day equal to 1 + your Charisma modifier your spell effects can be invisible and inaudible or they can pass through solid barriers as if they did not exist (line of effect is not disrupted by solid barriers). A celestial-born sorcery spell uses up a spell slot one higher than the spell’s actual level.
Feats 101. Copyright 2009, Steven D. Russell.