Black Keys

Black Keys are keys that are pitch black that open gates to the Celestial Spirit World, and unleash Dark Celestial Spirits.

Description
Dark Celestial Spirits, are very similar to regular Celestial Spirits, but they do have differences. The most prominent of these differences, is that Dark Spirits do not use a contract when being summoned. Instead, in order to gain control of a Dark Spirit, one must make a deal with the Celestial Spirit King, or, which is unlikely, be given permission by the Dark Spirits themselves This is due to the fact that they are prisoners in the Celestial Spirit World. When summoned, Dark Spirits have chains around some part of their body, that often lead back to their keys. This indicates that they are less like partners, and more like slaves. In order for them to be fully broken from the holds of their masters, their shackles must be broken.

Dark Spirits

 * Orion: The Hunter, Orion appears as a tall man dressed in hunter-garb, and carries a large bow and arrow, with a hunter's knife on his hip. Orion is noted for his remarkable accuracy is battle, and is famed as an individual who never missed. However he does not have as much power behind his arrows as Sagittarius. Orion's chains appear as shackles around his wrists.
 * Cetus: The Sea Beast. Cetus is an enormous sea monster, with large tentacles, and is capable of controlling water to his own ends.  Cetus' chains appear around his chest.
 * Ursus Major: The Bear. Ursus Major appears as a demonic bear, with a large skull covering its head, and very prominent claws.  Ursus Major's chains appears as shackles around each of its ankles.
 * Canis Major: The Dog. Canis Major appears as a large, demonic dog with black fur, and glowing red eyes.   Its chains appears as a collar around its neck.
 * Draco: The Dragon. Draco appears as a large, monstrous dragon.  Draco is very powerful, and feared by many.  Despite being called "Dragon" Draco is not a dragon in the sense, but is a celestial spirit.  His chains appear his wings.