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Celestial Aggregor (What If...?) — Description
(this is meant to be Ben 10 version of Infinity Ultron)
In this universe Kevin listened to Ben and absorbed his Omnitrix, having the power of the first 15 alien he thinks he can overpower Aggregor but he can't and Aggregor absorbs him and proceed to absorb the Baby celestial Sapien but as he didn't use the machine of the full power he gets only 1/12 of his powers, furious of not having absolute power he absorbs Ben's Ultimatrix and Gwen Mana.
After 4 years he absorbed and beat Vilgax, The Ledgerdomain resistance leaded by Charmcaster and Hex, Khyber and some other less important threats.
And also when Dagon tried to conquer the universe he beaten both the Forever knights and Dagon and know have dagon's powers and Ascalon