Dark Pulse

You hurl a dark ball at a creature or object within range. Make a ranged spell attack against the target. On a hit, the target takes 1d6 necrotic damage. After the dark ball hits its a target it explodes into a dark pulse dealing half of the damage of the original dark ball to every creature 20 ft of the intended target. Each creature in the impact area must make a Constitution saving throw. Every creature takes full on a failed save, or none on a successful one.

In each recast of this spell, every creature in its impact area must make a Constitution saving throw for each recast.

Undead creatures are immune to this spell.

This spell's damage increases by 1d6 when you reach 6th level (2d6), 10th level (recast 2x 2d6), and 17th level (recast 3x 3d6)