You hold strong against aberrations.
Prerequisites
Favored enemy (aberration) ability.
Benefit
Choose either Fortitude saves against effects that cause transformation (including transmutation spells and spell-like abilities) or Will saves against mind-affecting effects. You gain a bonus on the selected saving throw equal to half your favored enemy bonus.
Against the spells and abilities of aberrations, you gain this bonus on both types of saves, regardless of your choice.