Beshadowed Blast

Warlock Invocation
Level: Lesser, 4th lv.
Components: V, S
Casting Time: 1 standard action
Range: 60 feet
Duration: Instant
Saving Throw: Fort
Spell Resistance: Yes

This eldritch essence invocation allows you to change your eldritch blast into a beshadowed blast. Any living
creature struck by a beshadowed blast must succeed on a Fortitude save or be blinded for 1 round.

(Complete Arcane, Page 132)