Blood Magic Resurgence

Choose 1 willing creature and 1 magic item that uses charges that you can touch. You magically extract the lifeforce of the creature, adding 1 charge to the magical item. The creature permanently looses hp based on the percentage of its max hp depending on the rarity or how powerful the item is. The DM decides how much hp is lost. The hp is restored only after the charge on the magic item is used and a long rest has passed, even if the creature reaches 0 hp and is recovered.

Common - 15%

Uncommon - 30%

Rare - 40%

Very Rare - 75%

Legendary - Creature hp is permanently reduced to 1 hp, if the creature takes damage equal to or greater than their max hp, they die.