Moon Jade

Moon Jade is an artifact-ability level summoning item.

Description
The item is one of the jewels that decorate 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 an 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.