Doomspeak

(Champions of Ruin, page 20, DnD 3.5)

[Bardic]

You can demoralize an enemy with horrible condemnations and grim portents of impending doom.

Prerequisite

Intimidate 8 ranks, Perform 8 ranks, Bardic music class feature

Benefit

You can spend one of your bardic music uses to utter a string of crass and appalling epithets and curses at one enemy within 120 feet. The intended target must be able to hear and comprehend your damning remarks. A target that fails a Will save (DC 10 + your character level + your Cha modifier) is cursed with a -10 penalty on attack rolls, saves, ability checks, and skill checks for 1 round. This is a supernatural, necromantic effect.