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Sewer Rats are special variant of Tunnel Rats wearing olive-green garbs and can only be encountered during the Pete the Invincible mission. They are spawned if the valve to the left of the Raid Post in Pyro Petes' arena is used.
- Each time the valves are used, their levels are increased by 3, with a cap of 46 in Normal mode, of 66 in True Vault Hunter Mode, and of 88 in Ultimate Vault Hunter Mode.
- At any time there can be no more than 7 Sewer Rats present in the arena.
- Killing Pyro Pete kills any Sewer Rats that still might be present in the arena.
- Regardless of the game mode, their name remains unchanged.
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