Bone Armor

Touch one creature and coat it in bones, summoned from the demi-plane of Oogdaroog the bone collector, and increase its AC by 1. If the target is hit then decrease this bonus by 1 if the bonus is reduced to 0 the spell is dispelled otherwise it lasts for 30 minutes.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the AC bonus is increased by 1 for each slot level above 1st.