The Knull of Earth-TRN767 presumably shares the history of his counterpart from Earth-616 - having created the symbiotes to corrupt and consume the gods and their creations, returning the universe to the Void; only to have been imprisoned by them at the core of the Symbiote Throneworld.
After being freed from his Klyntar, Knull attacked Earth but was defeated and seemingly killed by Venom. However, Knull survived the battle and was sent into a recuperating coma.
Powers and Abilities
Symbiote Armor: During his time as the God-Host, Knull wore a suit of black armor with red dragon emblems on its chest and back, manifested from the living abyss.