You are consumed with hatred toward your foes. You develop Hatred for a group. When encountering the subject of your Hatred, you must attempt a Psychology Test or immediately attempt to destroy the hated group by the fastest and most deadly means possible. You gain +1 SL on all Melee and Ranged Tests against the specified group, and are immune to Intimidate and Fear (but not Terror) caused by them.

Examples you could take include: beastmen, goblins, orcs, monsters, outlaws, Sigmarites, undead, and witches. The full rules for Hatred can be found on page 184.

Core Book, Page 120