Create Healthstone

You consume a Soul Shard to create a Healthstone; a dark-green stone with light-green light emitting from it. The healthstone is roughly the size of a medium-sized rock and emits life essence. As an action, a creature can crush and consume the stone, being healed for up to half the creatures Hit Dices. The Hit Dices are consumed with the Healthstone. 

(See the Homebrewed spell Drain Soul to gain a Soul Shard)