Entropy

     Make a melee spell attack. On a hit, your hand burns into a target’s skin, transferring a seed of entropic decay. The target suffers 4d8 necrotic damage, and then another 1d8 necrotic damage at the end of each of its turns until the spell ends. If the creature dies while under the effect of the spell, it explodes. Any creature within 10 feet of the explosion must succeed on a Dexterity saving throw or suffer 2d8 necrotic damage.