Improved Fury of the Tainted

(Combat) Your hatred for goodness is rivaled only by your ability to repel it.

Prerequisite: Cha 13, Fury of the Tainted, base attack bonus +8, rage class feature, tiefling.

Benefit: While raging, you gain spell resistance equal to 10 + your class level against spells with the good descriptor.

Source: Blood of Fiends