Demonic Deal (3.5e Feat)
From D&D Wiki
Demonic Deal [Class]
Dealing with demons constantly sapping your energy eventually you either find loopholes or make some deals.
Prerequisite: Fox of Sin
Benefit: You can remove additional dice from the cursed retaliation. Pool up to your Fox of Sin level. Any time you would remove cursed dice from the retaliation pool you may add your Fox of Sin level to the dice removed.