You cause the target’s bones to explode violently within its body. The target must make a Constitution saving throw equal to your spell save dc. On a failed save, the target takes 6d6 necrotic damage, and all creatures within a 20-foot radius must make a Dexterity saving throw, equal to your spell save dc taking 3d6 necrotic damage on a failed save, or half as much on a successful save.
On a successful Constitution saving throw, the explosion is contained within the target’s body, and the target takes half damge. There is no effect on creatures within the radius in this case.
At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage for the target increases by 1d6 and the damage for creatures in the radius increases by 1d6 for each slot level above 5th.