Aberrant Tumor

To the surprise of others, that strange growth on you is actually your spellcasting companion.

Prerequisite: Aberrant bloodline.

Benefit: You gain a tumor familiar, as the tumor familiar alchemist discovery (Pathfinder RPG Ultimate Magic 17), with an effective alchemist level equal to the level of the class that grants your aberrant bloodline for determining the tumor familiar’s abilities. If multiple If an ally is under the effect of this feat and fails a saving throw against a fear effect, she can choose to end the battle cry’s effect on her to reroll the failed save. The ally must take the result of the reroll, even if it’s lower. Each ally can use this effect only once per use of this feat.

Source: Advanced Class Guide