Jade Skull of the Sun King

Wondrous item, rare (requires attunement by a spellcaster)
  This jade skull wears the crown of a fallen Sun King. Legend says that each king had to prove themselves worthy of the blessing of a couatl so that they may from craft their own crown from its gifted feathers. The stories also tell of the power stored in these precious artifacts, and of the hubris of thieves. Those for whom the crowns were not intended are subject to bestial curses should they try to don these royal raiments.
  Vestigial Radiance. While holding the skull you can cast the word of radiance or dancing lights cantrips from it at will.
  Blazing Eyes. As an action you can brandish the jade skull in front of you and speak its command word. Casting the scorching ray spell at 3rd level, and dealing radiant damage instead of fire. You can use this property a number of times equal to your Intelligence modifier, regaining all expended uses when you finish a long rest.
  Curse. Removing the crown from the jade skull, curses the last creature that touched the crown until the crown is once again placed upon the jade skull. While cursed, the crown appears on the head of the cursed creature and transforms it into an accursed feathered ape, multicoloured like a couatl. The ape is unwilling to part with the crown, and is hostile towards any creature that it can see within 60 feet. When the curse ends, the creature reverts back to its original form, and gains two levels of exhaustion. This curse can be removed from this item by wish spell or a deal with a Couatl.