You can directly name it with the doomsday prefix. For example, "The Legend of the Apocalypse", "The Dawn of the Apocalypse", "Insect Zombies and Humans", "The Apocalypse is Coming", "The Brave Reborn in the Apocalypse", "The Apocalypse and Destruction", "Disaster", "God's Favor", "The Apocalypse" "Cultivation" and so on are all good names.