You touch a creature to heal their injuries at the cost of your own vitality. You spend one of your hit dice, the creature regains a number of hit points equal to your hit die + your spellcasting modifier (minimum of 1). This spell has no effect on undead or constructs.

You can expend additional hit die when you reach 5th level (up to 2 hit dice), 11th level (up to 3 hit dice), and 17th level (up to 4 hit dice).