Stone of Purity

This artifact was created through powerful transmutation magic used on the crown of the blood queen Varoda. One of the seven pieces of the crown and one seventh of the queen's magic power were fused into this large, blood red crystal. Previous owners of the stone have tried to keep it hidden away from diviniation magic, as it could attract power hungry individuals or those who would seek to free the Red Queen from her banishment. Although it holds great power, to wield it comes at a great cost.   Price of Power. Before you can become attuned to the artifact, you must kill a creature of your own alignment. You then have to spend 24 hours with the item without taking a short or long rest to fully attune to it. Once you are attuned to the stone, it changes to the size of one of your fingers and hovers in front of your forehead. You can use the stone as a spellcasting focus.   Royal Purity. While you are attuned to this artifact, you gain the following benefits.

• You gain a +1 bonus to spell attack rolls and your spell save DC.
• Your Constitution score increases to 22, if it is already equal to or greater than 22, the item has no effect on your Constitution score.
• You and allies within 30ft. of you are immune to being Poisoned or Diseased.
• You gain a +2 bonus to your AC while you have an amount of hit points remaining equal to half your maximum hit points.

  The Blood is the Life. While attuned to this artifact, you have disadvantage on Wisdom, Intelligence and Charisma saving throws against spells and other magical effects. Additionaly, every 24 hours you have to consume one pint of blood from a humanoid or gain 1 point of Exhaustion after you finish your next long rest.