In s1 we also see a viltrumite using a staff in a flashback

No, pretty sure he killed the invincible he was fighting. Granted, this mark claimed he had killed his universe’s spawn but the power of characters seems to be different in alternate universes bc let’s be real Invincible ain’t got nothing on Spawn

This dude is the equivalent of the final boss in the invincible universe I don’t think we’ll be seeing him anytime soon