Berserk

Berserk is an Ability introduced in seventh generation. It is the signature Ability of Drampa.

Effect
Every time the HP of a Pokémon with Berserk drops below half, its Special Attack is raised by one stage. If the HP falls below half due to indirect damage, Berserk won't activate.This ability has no effect outside of battle.

Pokémon with Berserk
Drampa