Crown of the Trickster

Illusion. The Crown of the Trickster, once worn by the Goddess of Mischief herself, is a radiant diadem that weaves reality into dazzling illusions. Now it rests at the heart of the Evermaze in the Feywild, perched upon the horn of a fearsome minotaur that stalks its endless path.
The Loom Weave of Eightfold A Treatise on the Arcana of Balance, page 1

One of the items that the mind flayers are trying to collect to take over the world??

From the school of Illusion – Shadows cast by the Heartwood’s canopy, deceptive yet mesmerising.