Amulet of the Dead

This amulet bears the symbol of a dark deity inlaid with precious stones and metals. If someone dies within 120ft of you while attuned to the holy symbol, you may attempt to steal their soul. The user may use an action to attempt this, and the person/being who owns the soul must make a 16 CON save or have their soul trapped in the amulet. The user has 1 min. after death to attempt this feat, and can only attempt it once per soul.

Once the amulet has 5 or more souls stored inside, the souls inside may each attempt another 16 CON DC to try and escape the amulet to their after life. Each soul may make the attempt every 24hrs or until their are 4 or less souls inside. The user may also use an action to release one, or multiple souls from the amulet; and they can choose which souls to release.

Add together the CR and/or level of all the souls trapped inside the amulet, the user gets that many spell slots to use, halved.  A.K.A. their are 3 souls inside worth a combined 25 levels/CR, the total spell slots available to the user would be 12; a 1st level spell would cost 1 spell slot, while a 7th level spell would cost 7 spell slots. The user regains spent spell slots 24hrs after using them.