Barkskin

2nd-Level Transmutation Spell (Druid, Ranger)

Casting Time: Bonus Action
Range: Touch
Components: V, S, M (a handful of bark)
Duration: 1 hour

You touch one willing creature to protect it with regenerating bark. Until the Spell ends, the target's skin assumes a bark-like appearance, and at the start of each of the target's turns, the target gains a number of Temporary Hit Points equal to your spellcasting ability modifier plus your Proficiency Bonus.

At Higher Levels: When you cast this Spell using a Spell Slot of 3rd level or higher, you can target one additional willing creature for each slot level above 2nd.

Source: Cleric and Revised Species