Planetary Celestial Gate Keys

The Planetary Celestial Gate Keys (惑星星辰関基幹 Wakusei Seishin Seki Kikan) are a set of ten keys used to summon Celestial Spirits for Celestial Spirit Magic. They are similar in power to the Zodiac Gate Keys, but are slightly harder to find due to their somewhat recent discovery.

Description
The Planetary Celestial Gate Keys are, as stated above, keys used to summon Celestial Spirits, however, the spirits summoned from the Planetary Gate Keys each represent a different planet in the solar system as opposed to a constellation. There are ten known keys in all, each of which is a black-purple color, with a jewel embedded on the end opposite the teeth. The color of the jewel depends on the spirit the key is linked with. The keys are also notably larger in comparison to their more common counterparts. Compared to normal Celestial Spirits like the Silver and Zodiac Spirits, the Planetary Spirits are much more independent, so it takes a mage of considerable skill to be able to wield one efficiently and make them obey their orders.