Vampiric Feast

Requirements
spellcraft:24

Description
When this spell is cast you drink in the life force of creatures in the AoE. Creatures who succeed at a save lose only half their remaining hit points, while those who fail their saving throw lose all their remaining hit points and are instantly slain. The total amount of damage done by this spell is then added to the casters Hitpoint total. Moreover, the life-force of slain creatures coalesces as a greater shadow, which will attack any surviving enemies, very powerful creatures are unaffected by this spell. You are only able to absorb enough hit points to restore you to full health, remaining points dissipates into the fabric of the weave.