Target creature gains 3d6 Absorption Hitpoints. The spell ends if the target goes either reaches 0 hitpoints, or reaches 0 Absorption Hitpoints.

Absorption Hitpoints: When the target creature takes damage it loses Absorption Hitpoints equal to half the damage taken and block half of the damage of the attack. (If you take 18 damage, you will take 9 damage, and lose 9 Absorption Hitpoints.) Absorption Hitpoints have no effect on 

At Higher Levels: Add 1d6 for each spell level above second.