Ud-Meiyu (ウド゠メイユ) is a boss enemy from Ys VI: The Ark of Napishtim, encountered near the end of the Ruins of Lost Time.
After Adol collects the second of the fragments of the Mirror of Zeme in a room surrounded by lava, the homunculus Sera appears and summons Ud-Meiyu. Adol ultimately defeats Ud-Meiyu, clearing the path towards Zemeth Sanctum.