Corpse Explosion

You choose your target, ball your hand into a fist, and a corpse explodes, causing all creatures within 10 feet to make a DEX save. On a fail, the creatures take 2d8 necrotic damage, or half that amount on a save. At higher levels, this spell does an additional 1d8 damage for every level above 2nd level.

If this spell kills another creature, the caster can use a bonus action to cause that new corpse to suffer the same fate and causes the same reaction as above, damaging all creatures (DEX save again) within 10 feet for 2d8(or the higher roll that it was cast at) without expending another spell slot.