Bone Armor

A swirl of bone surrounds you, and grants you a +1 bonus to AC, 20 temporary hit points, resistance to necrotic damage and nonmagical physical damage, and dealing 1d4 piercing damage to melee attackers. For every 2 levels above 3rd this spell is cast, the user is granted an additional 20 temporary hit points, an additional +1 AC and an additional d4 of piercing damage to melee attackers. In addition, the duration increases to 8, 12, and 24 hours at 5th level, 7th level, and 9th level respectively.