Anyin’s Field of Necromancy

A field invisible to everyone except the user. Dark in nature as souls upon souls erupt and surround the enemies inside, sucking their life away. All creatures inside this 10ft radius, where the user can see, have to make a Constitution saving throw or lose 10 hit points upon entering or ending their turn inside this field for 1d6 rounds. At the end of their turns they can repeat a Constitution saving throw to null the effect. 

At Higher Levels. At higher levels above the second, you increase the hit points stolen by 20.