If you start your turn below half health, you must succeed on a Wisdom saving throw or enter a state of bloodlust, where you must use your action to attack the nearest creature.
It activates after 15 seconds of chasing, increasing the Killer's movement speed. It has three tiers, with Tier 3 reaching maximum speed at approximately 35 seconds.
A mechanic that helps Killers catch up to Survivors during a long chase.