Time Travel: Everything Ends in Nothingness

[Brainless and cool novel, two heroines, the protagonist is not a virgin, let alone a dog licker] There is magic, martial arts, and magical martial arts here. There are demons, vampires, monsters, and of course humans here. A bad college student travels to a different world and finds that there are too many elements here. Like countless well-known fantasy novels fused together, the essence of this world is nothingness...