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A Mud Monster is a Ninjago creature, very similar to Rock Monsters from Power Miners, except that they are made out of Mud, not rock and crystals. Lord Garmadon ordered the Mud Monsters to attack Wu, but saved him by pulling him out of the Mud Monsters, only for the reason that Lloyd was in trouble. They appeared in the episode 'Once Bitten, Twice Shy".
Three Mud Monsters attacking Sensei Wu