Chaos Blast

within range, a powerful blast of necrotic and lightning energy is spewed from the hands,or arcane focus and consumes a creature. With a failure on an constitution save against the users spell save dc, the foe takes 4D10 necrotic damage, and 4D10 lightning damage. On a spell save the creature takes half as much of the damage.If one wishes, the spell allows the consumption of ones life force to add to the damage. If one invokes a certain amount of hit points to add to the damage, half of the hit points is added to the total of the damage. For one must not use chaos magic without a price.....

At higher levels- spell inc. by 1 D10 for both necrotic and lightning damage higher than 5th level