Aurora Borealis

Aurora Borealis is a monster-sized sea slug made by Imperial Thousand Chaos to be a planet destroyer. It has a hexagonal stellar plate lodged into its back that dissolves if it ever comes in contact with air and releases a toxic gas that can destroy all life. It is currently dormant deep in the ocean unknown by Chaos Master. The markings on its body naturally glow, which lures in other deep sea creature that Aurora Borealis can then catch and eat.