Gowther, with his powerful demon mage abilities and absolute spell that erases memories, proved to be a formidable opponent. Despite Mirai's time-controlling skills and experience, Gowther's Commandment of Selfishness was able to affect Mirai's memories and sense of self, rendering him vulnerable to Gowther's attacks. In the end, Gowther's combination of magic prowess and strategic abilities enabled him to outsmart and overpower Mirai in this battle.