While wearing this crown, the wearers intelligence automatically drops to 10 and can not be changed, but their spellcasting modifier becomes +28 for attack rolls, damage is doubled and any spells that require a save are made at disadvantage. The wearer also gains disadvantage on all intelligence, wisdom and charisma saving throws. 

As a one time use, the wearer of this crown can cast Catalyst of Desire without destroying the crown. After this has been done, the wearer falls under the spell of the crown. They must roll a 1d20 daily, and on a 1, the crown attempts to take control of the body. The wearer must make a wisdom save (DC18), on a success only 1 attempt is applied, on a fail it counts as 2. When a total of 242 attempts have been made, the wearer turns into a Lich King, where their skin turns blue and their hair turns white.

The wearer can take off the crown but the curse will remain attached to them regardless, so the daily rolls will need to be made.

When the crown is destroyed the world is frozen in ice for 400 years.

Notes: Creation, Damage, Control, Social, Utility, Cursed, Headwear, Sentient, divination, transmutation, enchantment