Adamantine Skin

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

Additionally, critical hits from weapon attacks counts as regular hits against them.

Further, anytime the target takes damage (of any kind except psychic or poison) not exceeding 10 damage, reduce the damage to 0.