Dim Utterance
Level: Brd 4, Clr 5, Sor/Wiz 4, Brakah 5, Zhakrin 5
Components: V
Casting Time: 1 action
Range: Personal
Target/Area/Effect: All creatures within a 30 ft. radius burst, centered on you
Duration: Permanent (D)
Saving Throw: Fortitude negates
Spell Resistance: Yes
Upon vocalizing dim utterance, all creatures within a 30 foot radius burst of you must save or become blinded. In addition to the obvious effects, a blinded creature suffers a 50% miss chance in combat (all opponents have full concealment), loses any Dexterity bonus to AC, grants a +2 bonus to attacker's attack rolls (they are effectively invisible), moves at half-speed, and suffers a -4 penalty on most Strength- and Dexterity-based skills.
    The Dungeon Master's Guide has more details on the effects of blindness.