Enough Already!
Uncommon20.1%Story
You continued to defeat Ultros to the bitter end.
Ultros is the recurring comic-relief boss you fight several times across the World of Balance. This unlocks when you beat him at his final encounter on the Floating Continent, where he ambushes you alongside Typhon (Chupon). Every Ultros fight comes through normal story progression, and the Floating Continent battle is mandatory, so you can't miss it.