Drain Soul / Drain Essence

2d8 Magic Damage / Turn. Negatable by breaking Line of Sight, leaving range, antimagic effects, Counterspell.... and everything else that counters spells.

You reach out with your hand to a creature that you can see (or touch the target creature directly)  and start to drain the soul / essence of the target creature. A visible flow of essence travels from the target creature towards you and is being absorbed by you, dealing non-type magical damage each turn.

This spell always hits, but can not critically strike. Usage is limited by your lifeforce only. Draining the Soul of a living creature is an evil act, and is being regarded as such.

Draining the Soul of other living beings is a powerful ability only available to powerful spellcasters or power demons and devils, and is being regarded as such. 

Draining the Soul of other living beings greatly enhances your lifespan, while draining the essence of undead creatures greatly shortens your lifespan.

Draining the Soul of other living beings may alter your physical appearance, as well as your spiritual Aura. Your mind might be affected as well. 

Draining the Essence of Undead beings darkens your spiritual appearance and may come with unexpected sideeffects like tiredness, paleness, nightmares, depression, the need to be alone and other.

Effects on Life Expectancy:

Drain Soul: Damage Dealt / Max HP of Target Creature / (Powerlevel Difference Caster-Target(GM Discretion)) = X% of (Life Expectancy - Current Age) of Years added to your lifespan. Greater Effect on Demons and Devils (or other Soulcollecting entities (warning, using drain Soul on "Death" may lead to spontanious combustion caused by overflow of your current physical form.)

Drain Essence: Undeads don't have life Expectancy: -> You lose years based on powerlevel of target creature. Further Improvement of this Spell may lead to the ability to multiply damage against undead.