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
Instead of healing, the armor brutally "fixes" injuries by injecting thin metal spikes into the wearer's flesh to pin broken bones and joints back together, allowing them to continue fighting until their body completely fails. The armor is described as a "villainous item"