Corpse Explosion

You choose your target, ball your hand into a fist, and a corpse explodes, causing all creatures within 5 feet to make a DEX save. On a fail, the creatures take 2d8 damage, or half that amount on a save. At higher levels, this spell does an additional 1d8 damage for every other spell higher than 2nd.

If this spell kills another creature, the caster can use a bonus action to cause that new corpse suffers the same fate and causes the same reaction as above, damaging all creatures (DEX save again) within 5 feet for 2d8(or the higher roll that it was cast at) without expending another spell slot.