Berserk - Berserker Armor -

The armor is described as a "villainous item" because it eventually consumes its wearer. Berserker Armor | The Evil Wiki | Fandom

The is a cursed, magical artifact from Kentaro Miura’s Berserk , forged by the dwarf blacksmith Hanarr. It serves as both a devastating "power-up" and a central metaphor for the protagonist Guts' inner struggle between his humanity and his destructive rage. Core Mechanisms and Functions Berserk - Berserker Armor

It suppresses the sensation of pain and fear, allowing the wearer to exert 100% of their physical potential. The armor is described as a "villainous item"