Divine Shield

Choose a creature within range. A Glowing shield of divine energy appears and encases the target within its creature space. The target of the spell receive a bonus of +2 to its AC, +5 temp hit points and saving throw rolled gains +2 while a shield is on it. The shield will reflect any necrotic magic damage taken. If the target is within a zone of effect that could result in damage, one shield also disappears. In addition, the target of the spell receive a damage reduction of 2 per active divine shield. All divine shields disappears within 2 turns it at the end of battle if any shield(s) remains at that time.

You create an additional shield at 5th level (2 shields), 11th level (3 shields) and 17 level (4 shields).