Eldons protective aura

The casters AC is increased by one plus the spell level. Whenever a creature inside the aura and is viewed as an ally to the caster is attacked a spectral from of the caster appears in front of that ally and will take the hit. The attack must hit the new AC of the caster to hit the spectral form, if the attack hits the caster will take the damage. The spell ends if the caster makes a physical melee attack or cast a different concentration spell. The caster is able to make spell attacks. If cast at a higher level, the number of spectral forms is increased equal to the spell level.