Antimatter cannon

The Antimatter Cannon was a device invented by the Anti-Monitor to spread antimatter across the multiverse to destroy every infinite Earth in existence. It was built on Earth-1, as this Earth was the central juncture of the entire multiverse, to allow the antimatter wave it created to permeate into every universe, destroying them all systematically with Earth-1 being last. The machine required a speedster to power it by running on a treadmill. The Anti-Monitor test fired the weapon on Earth-2, completely destroying that universe. On December 10, 2019, the cannon was unleashed on the entire multiverse, destroying every Earth until the Flash, Vibe, Killer Frost and Pariah discovered the machine under Central City, with the Flash of Earth-90 powering it. Vibe managed to get Flash-90 off the treadmill, but this triggered a fail-safe that would destroy every Earth immediately. Pariah summoned Black Lightning from an unknown Earth to help contain the energy of the cannon and buy time to find a solution. Flash-1 decides to sacrifice himself by running backwards on the treadmill to cause the wave to recede, the stress of which would kill him. However, Flash-90 temporarily steals Flash-1's speed and takes his place on the treadmill, succeeding in stopping the wave and saving Earth-1, the last Earth in existence, but disintegrating in the process. The victory was short-lived though when the Anti-Monitor used Harbinger to destroy Earth-1, with only seven people surviving it's destruction by being sent to the Vanishing Point by Pariah, the one place the Anti-Monitor cannot reach.