Moon Jade

Moon Jade is an artifact-ability level summoning item.

Description
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
It has the ability to summon a maximum of three magic beasts out of thin air.

Trivia

 * The Moon Jade did not make its appearance in the anime.