Well of Abnegation

A small black orb appears at a point of your choosing within range; the orb is small enough to occupy the space of one creature. Creatures that being their turn in the space of the orb must make a Constitution saving throw or suffer 2d12 necrotic damage, or half as much on a successful save. As an action on your turn you can move the sphere up to 30 feet.

At Higher Levels: When you cast this spell using a slot 2nd level or higher the damage increases by 1d12 per level above 1st.