Transfusion

Your practice of hemalurgy has been refined enough that you know how to sap the blood of others for your own well being. You can cause your enemies pain in order to help yourself succeed and survive.

When you touch an enemy they will make a CON saving throw based on your spell save DC. On a failed save they will be connected to you via a spectral line that siphons their blood into your body. They take 2d12 at the start of your turn as long as you hold concentration and you heal half of the damage they take. On a successful save the spell has no effect and is wasted.

At Higher Levels: For every spell level cast above 2nd level, you add 1d12 to the damage done at the start of each turn.