Moon Jade

Moon Jade is an artifact-ability level summoning item.

Description
The item is one of the jewels that decorate the mouths of the serpents on the Staff of Ainz Ooal Gown. The gem is part of a set of seven divine class artifacts; when the seven are together, it can then unlock greater power beyond their base abilities.

Ainz used the Moon Jade to summon a Moonlight Wolf to test out magical summoning in the New World.

Appearance
According to the Light Novel, it resembles a decorative jewel.

Abilities
The jade is a divine class artifact with multiple abilities. One of its abilities is to summon a maximum of three magic beasts out of thin air.

Trivia

 * The Moon Jade did not make its appearance in the Anime or Manga.
 * In the Yen Press English version, it's called the Moon Orb.