Borrowed Life

You help up to 3 willing creatures within range to dig deep into their own life force to heal themselves. A target can immediately roll up to 2 hit dice to regain hit points, as it would on a short rest. When rolling these hit dice, a target can choose to use your spellcasting ability modifier in place of its Constitution modifier.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, each creature can expend an additional hit die for each spell slot level above 2nd.