Crimson Detonation

A sphere of volatile blood magic erupts at a point you choose within range. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one. The explosion spreads around corners and ignites flammable objects in the area that aren’t being worn or carried, leaving behind a faint crimson mist.

Empowered by Sacrifice. When you cast this spell, you can choose to take damage equal to half your level (rounded up). If you do, you can reroll a number of damage dice up to your proficiency bonus and must use the new rolls.

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