Bouncer

Bouncer is earned by completing the Boneyard with a Tank cat. This unlocks the Bouncer passive ability, which causes your Tank to automatically move 3 tiles toward the source of damage whenever an ally takes a hit, then attack the aggressor if in range. The upgraded version replaces the 3-tile limit with full movement range, letting you intervene from much farther away. This turns your Tank into a reactive bodyguard that punishes enemies for attacking your team. However, be cautious with friendly fire: if an ally damages another ally, Bouncer will trigger against your own teammate. Position carefully to avoid this drawback in builds that deal self-inflicted or splash damage.