Banshee Necklace

A strange necklace that has a gold chain. On the center piece is a coin-like object that has the picture of a dead female screaming on it. This necklace is a Banshee Necklace and is a very dangerous artifact of unknown origins. When attuned to(Arcana DC 15), the wearer gains the ability to use a Banshee Wail. This can be used 4 times per Long Rest and any creature within 30ft of the source is affected. When affected by the wail the target makes a Constitution Saving Throw(the saving throw is the wearer's Spell Save DC), taking 6d6 Psychic Damage on a failed save or half as much on a successful one. Every time this attack is used, the wearer of the wearer makes a Wisdom Saving Throw(DC 12), taking 3d6 Psychic on a failed save or none on a successful one. If this damage kills the wearer their soul is corrupted by greed, hatred, anxiety, lust, and despair and this magic warps the wearer into a Banshee. 

Notes: Arcana, DC 15, Cursed, Necklace, Jewelry