[The Low] Blood Crystal (Patreon)

Wondrous item, common

In the wild, raw blood crystal lines narrow passageways, nicking passing creatures, funneling their blood, and growing ever larger. When treated and properly enchanted, blood crystal can be tamed into returning the life energy which it sequestres, making a useful healing tool. Raw blood crystal is a pale pink, while crystal that has fed recently is a deep, sanguine red.

Imbue. As an action you can slice your hand and bleed onto the crystal, taking 2d4 + 2 necrotic damage as it hungrily sucks at your blood. Your hit point maximum is reduced by an amount equal to the necrotic damage taken until you next finish a long rest. The crystal gains charges equal to the slashing damage you take and can hold a maximum of 10 charges.

Recover. As a bonus action, you can hold the crystal to a wound and squeeze. The crystal expends all its charges and you recover a number of hit points equal to the number of charges expended.

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Uncommon variant: Increase the netcrotic  damage to 4d4 + 4 and the maximum number of charges to 20. The crystal gains the Sanguine Conversion property.

Sanguine Conversion. As a bonus action, a spellcaster holding this crystal can expend 20 charges to regain one expended 1st level spell slot.

Rare variant: Increase the necrotic damage to 8d4 + 8 and the maximum number of charges to 40. The crystal gains the Sanguine Conversion property.

Sanguine Conversion. As a bonus action, a spellcaster holding this crystal can expend 20 charges to regain one expended 1st level spell slot, 30 charges to regain one expended 2nd level spell slot, or 40 charges to regain a 3rd level spell slot.

Very Rare variant: Increase the necrotic damage to 10d4 + 10 and the maximum number of charges to 100. The crystal gains the Sanguine Conversion property.

Sanguine Conversion. As a bonus action, a spellcaster holding this crystal can expend 20 charges to regain one expended 1st level spell slot, 30 charges to regain one expended 2nd level spell slot, 40 charges to regain one expended 3rd level spell slot, or 50 charges to regain one expended 4th level spell slot.

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