Goblins, or Blood Demons (鬼).

Monsters that live by feeding on human flesh and blood. They hunt humans under the veil of night, devouring their lives and living for ages nearing eternity.

They possess physical abilities that far surpass ordinary humans, and even wounds that are torn or slashed heal in the blink of an eye. Severed flesh reconnects, and even lost limbs sprout anew. Some freely distort their physical forms or wield bizarre powers called Blood Demon Arts (血鬼術) through the medium of blood.

Only two things can lead them to death: the light of the sun that illuminates all things, or decapitation by a special blade. Since no other wound can result in death, they are truly immortal beings whom even death has turned away from.