Global Tower Defense: I Created Billions of Dark Legions

Traveling through a parallel world, this is actually a dark and turbulent era! Human beings around the world are building tower defense walls to resist the invasion of zombies, vampires, giant beasts, werewolves, evil spirits and other dark creatures! Luo Xiu rises with the system, leads all mankind to build tower defenses, and can summon and create his own super dark army. Smoke is everywhere. This era will be led by Luo Xiu...