Devour

The very essence of the target becomes your own, draining their existence to restore your own.

The damage done, is determined by the amount of whatever the castor chooses by the missing value. Ability score will do the amount lost in d12 (1d12*missing stat points), health will do half the amount lost in d8 (1d8*.5 missing health, min 1), permanently reduced health points will cause an additional 2 points of damage to the target per point returned to the castor.

Critical attacks with this spell cause whatever the castor chose to heal, to be taken directly from the target (i.e. drain target stats, or maximum health).