Corrosion is one of the Battlemode arenas in Doom Eternal. It is themed after the Blood Swamps level, taking place in a forgotten fortress that has been ravaged by a hellish swamp. Corrosion was added to the game as part of Update 6.
"Corrosion is a forgotten fortress that's been ravaged by a hellish swamp. Players will engage in frenetic firefights through the outer Battlements and ambush deep into the inner Catacombs. The Courtyard acts as the arena's centerpiece, and provides cover with plenty of mobility options."
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