Seal

A Seal is a massive concentration of the Phantom Stream that has become sentient due to absorbing positive emotional energy. They play a major role in SEALED.

History
Warning: Spoilers ahead.

Very few people know of the existence of Seals. They have been around for a very long time and possibly before the Cataclysm. However, each Seal does not know much of time before the Cataclysm, though legend has it that if they are all gathered together, one may access forbidden knowledge.

Their role is to gather themselves together with their Vassals so that they can annihilate themselves and the corruption of the Phantom Stream in order to close the Stream, bring the Outer Isles together with Spritz and reconstruct the planet as best as possible.

Characteristics
Each Seal embodies a particular natural element or concept. They are useless on their own -- they must have a Vassal, and that person is the one who uses the Seals' power. Several people are possible Vassals and the Gem of Laes can detect possible candidates. However, it is up to the Seals themselves to choose who their Vassal is.
 * Seal of Illumination, Lugh
 * Seal of Emotion, Innana
 * Seal of Dreams, Morpheus
 * Seal of Secrets, Diana
 * Seal of Life, Isis
 * Seal of Cascade, Mazu
 * Seal of Fortitude, Hephaestus
 * Seal of Rage, Dyeus
 * Seal of Passion, Ares
 * Seal of Sanctity, Ishtar
 * Seal of Time, Chronos
 * Seal of Space, Aditi
 * Seal of Void, Chaos

In-Game
In the game, usually once they choose a Vassal, you will receive their respective Seal item, which provides powerful Special skills that cost a lot of MP and have long cooldowns. Any potential Vassal can equip the Seal item, even if they are not bound to a Seal.