The Oxenfurt Sewers are a dark, ancient network of stone vaulted tunnels running beneath the academy town. This dangerous subterranean labyrinth plays a critical role in the main story and expansion quests, functioning as a hiding place for monsters and a secret entry point into the high-security Oxenfurt prison. The air is thick with miasma, and the brick channels are heavily infested with drowners, bloated rotfiends, and a predatory katakan, making it a high-risk zone for anyone attempting to bypass the Redanian military checkpoints above.