Tower of Fantasyis a free-to-play, open world, action RPG developed by Hotta Studio, a subsidiary of Perfect World. The game is set in the far future on the extraterrestrial planet "Aida", contaminated with a mysterious but potent radioactive energy called Omnium after a cataclysm that nearly wiped out human civilization and mutated the ecology of the planet. The player plays a wanderer that explores the world and fights mutant creatures and hostile forces as they advance through the story.