Binding Blast

Warlock Invocation
Level: Dark 7th
Components: V, S
Casting Time: 1 standard action
Range: 60 feet
Duration: 1 round
Saving Throw: Will
Spell Resistance: Yes

You transform your eldritch blast into a binding blast. Any creature struck by a binding blast must succeed on a Will save or be stunned for 1 round.
This is a mind-affecting effect.

(Complete Arcane, Page 134)