So here's my official theory about Knull for Tom Hardy's Venom: The Last Dance. Let me know what you guys think!I think Knull came from the MCU as the personification of darkness and was brought into existence as a god-like being when the Celestials brought matter and energy to his side of the universe. He settles on a planet, names it Klyntar and creates the symbiotes. However, a Celestial emerged through his planet, completely destroying everything on it. So he angrily creates All-Black The Necrosword and beheads that Celestial, who would become Knowhere. I think Arishem and the other Celestials separated him from the Necrosword and then banished him to the Sony verse. Venom in Venom: The Last Dance is his key to return to the MCU and enact his vengeance on all the Celestials.