Erjon's Call of Death

You weave necrotic milky tendrils from your hand, the ichor leeches toward a target. On a hit, the target takes 8d6 +(Your Spell casting modifier) Necrotic damage, if you exceed the target's armor class by over 3 the target takes an additional 2d6 necrotic damage at the start of their next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 +2 for each slot level above 3rd.