Blood Shell

A crimson colored barrier gets shape arround the caster. Whenever a non magical attack occurs, shell protects the caster. Whenever a melee attack targets the caster, attacker must throw a strenght saving throw against caster's spell save DC. In a failed save the caster has resistance that damage a instant moment, a succesful save dissmisses the barrier. If there is a ranged attack, barrier adds +3 to caster's AC and there is no dissmission. If a magical attack targets the caster, spell's magic and attacks magic get faced and DM says the result. 

Sacrifice caster takes a d6 slashing damage because of its wounds that source of casting matarial. Any sacrifice does not affect concentration of this spell.