Celestial Spirit Gate Key

Celestial Spirit Gate Keys, also known as Ecliptic Celestial Keys and variations thereof, were magical items that could be used to summon Celestial Spirits from the Celestial Spirit World.

Description
Celestial Spirit Gate Keys were unique magical items that could be used to summon specific Celestial Spirits from the Celestial Spirit World to any other universe in the third dimension. Each key corresponded to a specific spirit, and it seemed that only one of each key could exist at the same time. In order for a key to function, its corresponding Celestial Spirit must first have been previously bound by contract to the mage who held their key, for without the contract, the key would not respond to any kind of commands or use of magic. If a contract was established between the spirit and a mage, the mage could then summon the associated spirit by brandishing the key and shouting the word, followed by the key's full name. This opened the dimensional "gate" that existed between the mage and the spirit, allowing the spirit to pass through to the mage's universe. It seemed that there was a distinct difference in the level of power between spirits of Golden Keys and those of Silver Keys; the Golden Keys represented the Zodiac, and the Silver Keys represented all other constellations known to Earth.

History
In 150,081 CMT, Zev Raregroove used the Gate of the Ram Key to summon Aries to the Bebop II so that she could help him to pacify the over-hyperactive Coco. Kokonoe immediately took interest in Aries because she had never experimented on a Celestial Spirit who had been summoned using one of the Ecliptic Gold Zodiac Keys before. Although Kokonoe was so frighteningly eager to experiment on Aries that she had to be physically restrained by Zev while Aries cowered in fear, Zev later allowed Kokonoe to perform an examination on Aries on the condition that no harm would come to her. After the examination, Kokonoe asked Zev which other Celestial Spirit Keys he possessed. Zev replied. When Kokonoe asked Zev if he would be willing to demonstrate some of their abilities, Zev picked out the Gate of the Chisel Key and summoned Caelum, who fired a laser at a training robot as instructed before being returned through the Gate of the Chisel.

In 150,082 CMT, when Aries asked Zev if he had acquired the Leo and Capricorn keys, Zev answered her question by producing a necklace that the Leo, Capricorn, Aquarius, and Scorpio keys were hanging from. This revelation caused Aries to cry tears of joy.