Blood Soaked Shield

You expend one hit dice and a 1st level or higher spell slot to cast this spell if you do not expend the hit dice the spell does not trigger. If you expend both a barrier of blood springs up before your ally shielding them Until the start of your next turn, they have a +5 bonus to AC, including against the triggering attack, if the triggering attack would still hit roll your expended hit dice, the number rolled is the amount of damage from that attack that is nullified. In addition the caster of this spell mey chose to take the remaining dammage the target of the attack would have received instead.