Close Wound

You touch an ally creature and channel their inner life force to cause a surge of natural healing. If the target creature has at least 1 hit point, it can spend one of its Hit Dice, rolling the die and adding their Constitution modifier to the result. The creature regains a number of hit points equal to the total.

Alternatively, you can spend your own Hit Dice to heal another creature, following the same limitation to the amount of Hit Dice you can spend.

This number of hit dice a creature can spend increases by 1 when you reach 5th level (2), 11th level (3), and 17th level (4), adding their Constitution modifier for each hit die they spend.