Grendel is a powerful giant symbiote dragon created by Knull, a destructive creature that has roamed the universe for millennia, killing both gods and mortals. It was imprisoned by Thor in 500 AD and trapped in a glacier until its release in "The King in Black." Grendel shares the symbiotes' weaknesses, but his power is exceptional due to his direct creation by Knull, making him a formidable threat in the universe. There is no escape from my wrath, only submission.