Godzilla Mosquito

Long ago, the Godzilla Mosquito was defeated in the mortal realm by the demigod Zartas, who defeated it with the Lightswitch, an ancient artifact that can control the sun. This creature respawns every few millennium, as it’s corpse turns into an egg raft that spawns thousands of mosquitos that exist to eat each other until one remains. The longer this cycle remains unpurged, the larger the Mosquito gets.