Amulet of Collective Healing

A silver chain with a small ball-like pendant on the bottom of it. When the attuned user rests, the Amulet of Health glows dimly.

When taking a short or long rest, the user can put a number of hit die into the necklace (up to 2 hit die per rest). The Amulet can hold up to 10 hit die at a time. These hit die can be used as a bonus action and heal the user. If the Amulet was full on charges and the user chooses to expend all 10, the amulet explodes in a bright light. Anyone that the user chooses receives the full health of the 10 hit die multiplied by 2 (up to 5 people).

If the Amulet is used in this way,  roll a d20. On a 5 and below, the amulet loses all magical properties.