Demon Armor

You touch a willing creature, and a protective magical force surrounds it until the spell ends. The target's AC is increased by 1 for the duration or if you dismiss the spell as an action.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the bonus is increased by 1 for each slot level above 1st. When you cast this spell using a spell slot of 3rd level or higher, magic demonic spikes appear on the target which deal 1d6 force damage to any creature that hits the creature targeted by this spell. This damage increases by another 1d6 for each slot level above 3rd.