Black Hounds

Black Hounds (黒妖犬) are a type of fairy creatures with wild dog-like appearnces who will hunt their targets until their targets are either dead or if they have finished eating them. They have the ability to change their size depending on how threatened they feel, which is shown when Oslo grows immensely huge after Ban threatens him.

Appearance
A black hound is a dog-like creature with dark, purple fur; its neck is the only area with white fur. It has a fairly short tail and teeth that are very sharp and piercing. When it does not feel threatened at all, it shrinks into a small dog.

Personality
Black Hounds are wild predators who are insanely vicious and will not stop hunting their target until he are either dead or they are done with him. But occasionally, they can be domesticated as King tamed Oslo and befriended him.

Abilities/Equipment
Black Hounds are very powerful and fast, seeing as how one of them was able to easily defeat Andre and his partner, who were both apprentice Holy Knights. They also have the ability to change their sizes depending on how threatened they feel; black hounds grow huge if threatened greatly and shrink to a very small size, equivalent to a small dog, if not threatened at all.

The Black Hounds turn out that the Black Hounds are able to transport by their mouth, going to Fairy Realm to the Human Realm.

Trivia

 * Black Hounds are a reference to the black dogs in Britain's folklore.