Force of Will — Charm

At 3rd level, a Hellknight gains a +2 bonus on Will saves against spells with any one of the following subschools or descriptors: charm, compulsion, fear. At 6th level, the Hellknight chooses another subschool or descriptor from the list and gains a +2 bonus on his Will save against spells of that type, and the bonus provided by his first selection increases to +4. At 9th level, he chooses from the list again, and both previous selections increase by +2, so that he has a +6, a +4, and a +2 bonus, respectively, against spells of three different groups.