Doomblade

Doomblade is a weapon in Doom Eternal that is integrated onto the suit's left wrist.

The blade can cut through demon flesh like butter and defenses that are impervious to conventional weapons.

Codex description

 * A modification to the Praetor suit, the arm-mounted Doomblade is designed to increase the Slayer's short-range striking power. Strong enough to sever demonic flesh and bone, the blade's serrated edge allows the Slayer to break through enemy defenses an attack where conventional weaponry is ineffective.