Magic Eater

By touching a magic item you may, as a Magic Action, consume the magic within that item to replenish spent Hit Dice, rendering the magic item inert for 24 hours. The number of hit dice you recover is dependent on the rarity of the magic item. You may not drain a magic item held, carried, or attuned by another creature.

If a magic item has charges, you may instead consume a number of those charges to recover Hit Dice at a rate of 1 Hit Die per 2 charges consumed. You choose the number of charges consumed when you take the Magic Action required to drain the item. If an item has charges and requires attunement, then you must be attuned to drain the charges in this way. If you are not attuned, then you may only drain the item as per the rarity table above. If the item has a special condition when it hits 0 charges, that condition may activate as per normal.

If you are already at full Hit Dice, you may still consume the magic from items and become Overcharged, storing that excess energy as Bonus Hit Dice, but make sure to track them separately. You may only store a number of Bonus Hit Dice equal to half your maximum Hit Dice, and any excess of that burns away harmlessly. If these Bonus Hit Dice are not spent within one hour of you becoming Overcharged, the excess energy burns away at you from the inside. When this happens roll all accumulated Bonus Hit Dice, and reduce your current hit points by the sum of that roll. This loss of hit points may not be mitigated in any way.