Adonai's Bone Shield

When you take damage from a single source, you can cast this spell and attempt to transfer the damage onto an undead within 30 feet of you. That undead must make a constitution saving throw. On a failure, it takes the damage instead of you. If the undead is controlled by a necromancer, it adds the spellcasting modifier of that necromancer to its save. If the undead is controlled by you yourself, you can force it to willingly fail the saving throw. 

If the damage you transfer onto the undead would reduce it to 0 hit points, any excess damage is instead transferred over to you. For example, if you take 50 damage and shift the damage over to a zombie with 20 hit points, the zombie is destroyed and you take 30 points of damage.