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The Ancient Gods picks up after the end of the main story in a time where, due to the Slayer's actions, the armies of heaven and hell have fallen out of balance. The demons have flooded in to overtake the weakened angelic realm, so the Slayer's been called in to clean up the mess.

 

"The epic conclusion to the DOOM Slayer saga. You will invade Immora, the Dark Lord's last line of defense, protected by high walls and powered by advanced technology. You will also travel to new locations, from the ruins of old Sentinel settlements, to cosmic wonders of the Spear of the World, and even a devastated and overgrown city on Earth, hiding a mysterious portal. "