The Necromancer is amassing troops like crazy in the apocalypse

The impostor Necromancer, with inferior forces, is hunted and rejected by others.
The genuine Necromancer, with countless skeletons, becomes a ruling sovereign.
After obtaining the Double Doors, Wu Heng discovered that his world was overrun with zombies.
Plan A failed, and thus began the implementation of plan B for survival.
Wu Heng chose to become a 'Necromancer.'
Summoning undead is forbidden in this alien world? The post-apocalyptic planet is full of potential soldiers.
Impossible to survive in a zombie-filled world? Then let me live and learn skills in this alien realm.
Hence, an undead army armed with modern weaponry made its debut in this world.
A calamity engulfs the world, a million skeletons rise.
The Dead Bone Dragon, Undead King.
(Double Doors + Necromancer + Magic + Fantasy World + Undead Catastrophe.)