Stoneskin

Artificer    Druid    Ranger    Sorcerer    Wizard

Level 4 Abjuration

Casting Time: 1 action
Range: Touch
Components: V, S, M (diamond dust worth 100 gp, which the spell consumes)
Duration: Concentration, up to 1 hour

This spell turns the flesh of a willing creature you touch as hard as stone. Until the spell ends, the target has resistance to nonmagical bludgeoning, piercing, and slashing damage.

Source: Player's Handbook, p. 278