Brief Respite

You touch one creature, giving it a momentary reprieve from battle. If the target has at least 1 hit point, it may use its reaction to roll a single hit die subtracted from its maximum total of hit dice. The creature regains hit points equal to the total.
Once a creature regains hit points from this cantrip, the creature can’t do so again until it finishes a short or long rest.

The spell’s effect may be increased if the target chooses, when you reach 5th level (2 hit dice), 11th level (3 hit dice), and 17th level (4 hit dice).
This spell's effects do not count as a healing spell and will not trigger any abilities or spells related to the recovery of hit points, use of hit dice, or healing.