Demon Mastery

(Fiendish Codex I: Hordes of the Abyss, page 85, DnD 3.5)

[General]

You are particularly skilled at summoning demons and convincing them to serve you.

Benefit

You gain a +2 bonus on Charisma checks made to resolve the effects of planar binding and similar spells. Additionally, whenever you use a spell to summon a demon, your effective caster level increases by 1 for the purpose of resolving its effects.