Amulet of Purgatory

While wearing this amulet, you gain some magical abilities from the creature stuck inside the pocket purgatory.

For each level of the character inside the amulet, there are equal number of spell slots available. Once per long rest, you are able to set each spell. The list of spells will be what is available to the trapped character.

If a none magic user takes up residence in the amulet one of their main feats become available to the wearer. IE. Barbarian-Rage, Rogue-Sneak attack, and so on. 

The amulet also has the ability to raise a character that wears the amulet up to one hit point per long rest.