Tower of Multiverse

Fleeing from a fallen city, Draco found himself in the wasteland, where demons reigned free. Fortunately, the world has given Draco a chance to survive by inviting him to participate in the Tower of Multiverse, a place of both glory and violence. There, Draco will have to face the abominations from other worlds, while also keeping fellow humans in check.
However, Draco has an unfair advantage.
He had dreamt of all these stories in the Tower of Multiverse.