Humbly, Ben steps back. He lets the universe be born without his interference. The Contumelia leave, remarking that this "Ben" was the most interesting iteration they had met—a direct nod to the multiverse.
And for the fans, that’s enough.
For those who grew up with Ben, Season 6 offered a chance to say goodbye. It honored the past, lived wildly in the present, and (despite the cliffhanger) looked toward an infinite future. It was the end of a universe, but as Ben himself says in his final line of dialogue: “Don’t worry. There’s always another timeline.” ben 10 omniverse season 6