Crown of Wisdom (叡者の額冠) is a sacred treasure of the Slane Theocracy.
Regarded as one of the Slane Theocracy's greatest treasures, the Crown of Wisdom is the symbol of the Shaman Princess. This crown is used in the nation's magic ceremonies conducted by one of the Miko Princesses.
Described as a delicate artwork, Crown of Wisdom is adorned with countless small jewels decorated with gold threads, like droplets on a spider web. And at the center of the crown lies a large black crystal jewel.
While the limits in the New World prevent normal magic casters to surpass anything beyond 3rd-tier magic, save for a few exceptions, the Crown of Wisdom is an artifact that allows a user to bypass this limitation by using 7th-tier magic. However, for all its advantages, it has several severe flaws. One, it can only be used by one in 1,000,000 women in the Slane Theocracy. And two, which is a darker aspect of its properties, is the price of using this item. Once worn, the crown limits the wearer's thinking ability like a puppet, and it cannot be removed without leaving the wearer's mind ruined. The only way to nullify its power over the host is for it to be destroyed. But since this item is a national treasure, such a thought would be absurd.
- The detailed effect concerning the Crown of Wisdom is described as "Changes the wearer into an item that activates extremely high-ranked magic" in Light Novel Volume 2.
- Crown of Wisdom was stolen by Clementine after she defected to Zurrernorn. It was later destroyed by Ainz to free Nfirea from its influence.
- In the Web Novel, the Crown of Wisdom is used by the Miko Princess of Water in the Planar Eye ritual.