Sanguine Carcanet

Wondrous item, rare

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"The blood of my kind is pure and strong, blessed with power, and strongest when spilled."
This necklace of gold and obsidian has a blood-red ruby at the centre, and smells faintly of blood. Once per day when you are reduced to below half your maximum hit points, you can choose to regain a number of hit die and a number of sorcery points equal to your proficiency bonus.