Music of the Outer Spheres( Lords of Madness, p. 181)
You can use your bardic music to create discordant, insane sounds. This music is particularly effective against aberrations, and can sicken them, vitalize them, or fill them with lethargy.
Perform (any) 11 ranks, bard level 9th,
You can now use the following additional bardic music abilities. Lull Aberration (Sp): You must target a single aberration within 30 feet with this ability. You can target an additional aberration for every three bard levels above 9th that you possess. A targeted aberration must make a Will save (DC 10 + 1/2 bard's level + bard's Cha modifi er) or become lethargic and partially hypnotized by the discordant sounds of your performance. Affected aberrations are slowed, as per the spell. Sicken Aberration (Sp): Any aberration within a 30-foot spread centered on you must make a Fortitude saving throw (DC 10 + 1/2 bard's level + bard's Cha modifi er) or become sickened for as long as you continue to use this ability. If an aberration makes this saving throw, it does not have to make another saving throw to avoid becoming sickened unless you activate this ability again. Vitalize Aberration (Sp): All aberrations within a 30-foot spread centered on you gain a +2 morale bonus to all special attack and spell-like ability save DCs and a +1 dodge bonus to Armor Class.