Description[]
The Mus-A-M20 is a massive worm-like creature found in Lake Amagi. It is an optional boss and requires the Gud An-Na to defeat. Upon defeat, it will drop a medium Apocalypse Flask.
When encountered, it is idly traversing through the maze-like tunnels on the western side of Lake Amagi, releasing hot steam from its vents when the player comes close. From its mouth, it will create a large electric cloud and will pursue Indra when she comes near. The player must utilize the tunnels' abundance of stalactites to drop four of them onto the Mus-A-M20 and destroy it. It doesn't matter where on its body it is hit.