Planetary Spirit

For the related Magic, see Planetary Spirit Magic.

Planetary Spirits (惑星の精神) are magical beings from outer space that each live on their respective planet or moon. Some Mages, called Planetary Spirit Mages due to their specialisation in Planetary Spirit Magic, are able to summon Spirits by opening their Gates via the use of Planetary Spirit Gate Keys. These Keys are separated into three classes: the more common Lead Keys, the uncommon Bronze Keys, and the extremely rare Platinum Keys. Keys for Planetary Spirits are counted in Units (collectively without regard of Lead, Bronze, or Platinum), and a Planetary Spirit Mage is noted by how many Units they have obtained. All Planetary Spirits are named after a different Planet, Dwarf Planet, or Moon. Out of the eight Platinum Keys, four are owned by Primrose Wisteria.

Contracts and Rules
When a Planetary Spirit Mage receives a Key and open its Planetary gate for the first time, they have to set up a contract with the respective Spirit. This contract consists of asking the Spirit which days it can be summoned by it's contractor. This simple agreement leads to a dedicated and serious bond between the Spirit and summoner. However, under certain circumstances, i.e. during battle, and a Spirit is summoned for the first time, the making of a contract may be suspended on a later date. Contracts can be broken if the Mage gets arrested, leases the Spirit by themselves, or dies. When a Planetary Spirit Mage summons a Spirit, it appears directly next to them, as that's where the gates to Space have been opened. It's impossible to summon spirits elsewhere.

The Spirits must also abide by certain rules enforced by the Planetary Spirit Queen. The only rule that has been introduced in Fairy Tail so far is that a Spirit may not directly or indirectly kill its summoner under any circumstances. When the Gates are closed, it is required from both the summoner and the Spirit to agree upon the gate's closure. However, Spirits can also be "force closed" in battle, which means they can be forced back into Space by the summoner's will, though not every Planetary Spirit Mage is capable of doing such.

Planetary Spirits also have different categories of sorts that fall under the basic summoning conditions from their owner. For example, Mars summons himself most of the time without Primrose Wisteria doing so herself; Ceres has also summoned herself various times, as have many of Spirits. Also, if the trust between the Planetary Spirit and the owner is not an issue, contracts can be temporarily dissolved. It also seems that if the Planetary Spirit is strong enough, they can employ their owner Magic to stay int he Human World, when/if the contract is not in action. Additionally, Planetary Spirits grow stronger if their summoner grows stronger in terms of Magic Power.