A amulet made by an unknown devil for Asmodeus's daughter, Glasya, it is made of platinum and three clear crystals in the middle. After you attune to the amulet, one of the crystals turns blood red and can now be used.
The amulet grants a +3 to your Charisma score. After your character reaches 5th level then you can place a spell inside one of the crystals. You can use the spell the same way that you would a normal spell would be used. At 10th level you can use two crystals to hold two spells and using a spell from the amulet is a bonus action instead of a full action. At 15th level you can used all three crystals to hold spells and celestials will have disadvantage on attack rolls against you.
Cursed. After becoming attuned you have the desire to keep the amulet on you at all times. If someone takes it from you, then you will do anything to reclaim it. Fiends are drawn to the amulet and will try to take it from you.
Notes: Bonus: Charisma Score, Cursed, Jewelry