its Bounty Hunter's Resolve, one of Fett's abilities, Bounty Hunter's Resolve revives Boba at certain amount of hp in the start if the game and whenever he defeats an enemy https://swgoh.gg/characters/boba-fett/
He starts with bounty hunter resolve and if he dies and revives he loses it and can regain it by killing an enemy. As long as he dies in between killing characters and kills 4 characters he can theoretically revive 5 times. Nightsisters and scarf rebel pathfinder and any other characters that revive can inflate the math to infinity.
Replies
https://swgoh.gg/characters/boba-fett/
Night sister Zombie?
two boba's facing eachother can theoretically revive an infinte amount of times