You point an open hand towards a corpse, enveloping it with negative energy causing it to violently explode. Choose a corpse within range that you can see with a size of large or smaller to detonate. The size of the chosen corpse will determine both the radius sphere of the explosion and the damage dealt, as shown on the table below. Each creature in range of the explosion must make a Dexterity saving throw or take corresponding necrotic damage. On a successful save, creatures takes half as much damage. Once a corpse has been chosen for this spell, it may not be chosen again.

Some classifications of corpses are insufficient composition to detonate, such as constructs or oozes. Discuss with your DM to determine what conditions need to be met to cast this spell. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by one damage die, or two damage dice if the corpse belongs to a gargantuan size creature for each slot level above 1st. Using a spell slot of 3rd level or higher grants the ability to cast the spell on a huge size corpse. Using a spell slot of 5th level or higher grants the ability to cast the spell on a gargantuan size corpse.