The Doomsday Device was an antimatter bomb created to destroy the Earth in the event that Exofleet was going to win the Neosapien War. The antimatter for the weapon was created at a secret installation at the Great Slave Lake.

It was Phaeton's last weapon to stop Exofleet. It was sabotaged by Livia since she believed that the Neosapiens would again rise to power in the future.

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