Sealing Crystal

Sealing Crystal is a magic item that can store high level spells.

Description
In the New World sealing crystals are legendary items imbued with great power. The legends and tales revolving around these items originate from the Slane Theocracy. The nation was said to possess one at its founding and was a treasure left behind six-hundred years ago by the Six Great Gods. This items was the basis of the Slane Theocracy’s doctrine until its holder Nigun Grid Luin used it in a failed attempt to summon a high rank angel to defeat Ainz Ooal Gown.

Appearance
Sealing crystals seem to come in a variety of shapes and hold a quality of brilliance depending on what type of magic they contain.

Abilities
Sealing crystals are incredibly powerful artifacts in the New World, as they are capable of containing rank seven or higher, an impossible feat for humans who are unable to contain or cast such magic. Thus sealing crystals are considered extremely valuable to any nation that possesses one. The magic released by a sealing crystal can only used once so holders of these items would only use them as a last resort.

Trivia

 * Magic Casters highly prize sealing crystals as they are a subject of much debate and study.