Abyss-Bound Soul( Elder Evils, p. 11)
You have pledged your immortal soul to a particular demon lord in return for a gift that aids your evil works in life.
Your evil brand incorporates the personal symbol of your demon lord patron, who watches over you from the Abyss. You gain a +2 bonus on saving throws made against spells that have the good descriptor. Additionally, a tiny portion of your patron's power infuses your body, granting you an additional benefit. The exact benefit gained depends on who your patron is, as given below.