Developed by Ubisoft Quebec, the idea behind Immortals Fenyx Rising was birthed when an issue occurred during the development of Assassin's Creed Odyssey that caused the human characters to turn into cyclopses. The success of 2018's Assassin's Creed Odyssey made Ubisoft confident enough to give the project a thumbs-up, and thus Immortals Fenyx Rising, originally titled Gods and Monsters, began development.