A dark cloud that will relentlessly chase you when it spots you. Cloudon attacks by shocking the ground underneath with lightning. As it is a cloud, you cannot strike it with your sword while it is attacking you, leaving you with the option of running away, trying to find a ledge to climb on, or using the Shader MagicFreeze. To book it you only have to hit it with the Bestiary once. It is only encountered in the north west section of the map, and the game can be completed without even seeing one.
See: 3D Dot Game Heroes