Ancient Death Rancor

You summon a swarming horde of vengeful spirits that chase down a target creature within range. The target must make a Dexterity saving throw. It takes 10d8 necrotic damage on a failed save.
If the creature succeeds the save, it takes no damage, but must repeat it again at the start of your next turn as the spirits continue to pursue it. The creature only repeats the saving throw if it is still within range.
At Higher Levels.
When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot above 5th.