Retributive Invisibility

Warlock Invocation
Level: Dark, 7th
Components: V, S
Casting Time: 1 standard action
Range: Self
Duration: 1 round/level
Saving Throw: Fort (See text)
Spell Resistance: No

You can use Invisibility Greater as the spell, but you can only target yourself. If it would be dispelled, you emit a 20ft burst radius of 4d6 Sonic damage. Those who are damaged may Fort Save for half, or take full damage and be stunned for 1 round.

(Complete Arcane, Page 134)