Warning! Spoilers for King in Black #5 below!
Venom just became the most powerful hero in the entire Marvel Universe, as the King in Black finale gave him a power upgrade courtesy of Mjolnir, Silver Surfer, and the God of Light. In the event's epic conclusion, Venom took on Knull, the God of Symbiotes, but did so while hosting the powerful Enigma Force, Thor's hammer, and Silver Surfer's sword - turning the three weapons into something even greater.
Venom has come back from the dead thanks to the Enigma Force, an extremely strong force that is the King in Black's one true counter. As Knull seemingly was winning his battle against the Avengers and just about every hero and villain on Earth and across the galaxy, the Silver Surfer brought the Enigma Force back to the planet where it bonded with Brock. Venom became the new God of Light and the final showdown with the King in Black was set. Now, readers know just how powerful Brock became.
In King in Black #5 by Donny Cates, Ryan Stegman, JP Mayer, and Frank Martin, the Avengers and Silver Surfer prepare to battle Knull one last time. Venom appears glowing yellow as the new God of Light but it's not the only power he chooses to use. He summons both Silver Surfer's board (which was turned into a sword) and Mjolnir from Thor himself - in a scene that's similar to Cap wielding the God of Thunder's hammer in the final climax of Avengers: Endgame. Venom takes things a step further and combines the Enigma Force and two weapons and creates a battle axe that easily destroys Knull's army.
With the combination of powers, Venom decimates the King in Black's forces. He easily kills his symbiote dragons, while he chases down Knull and brutally stabs the axe into his chest. Once Knull's darkness has been stripped of his body, Venom flies into space and throws Knull into the sun. In doing so, he frees everyone from the King in Black's hold and saves the day.
While the Enigma Force would leave Eddie Brock, for the entire fight, Venom was the strongest person in the entire Marvel Universe. Knull's army beat just about every hero and villain across the galaxy - with ease. With the combined powers, he took out the King in Black like it was nothing, making one of Marvel's most powerful villains ever look like a plaything. The powers didn't last, but with them, he was an unbeatable cosmic force that could unquestionably go toe-to-toe with anyone in the Marvel Universe. The King in Black just found out the hard way.