Detonate Dead

When you see any creature die or fall to 0  hit points, green and black tendrils wrap around their body and explode, dealing 1d12+4 necrotic damage to all  creatures within 15 feet of the explosion. All nonmagical plant life that is caught in the explosion die and wither away. A successful dexterity save will cause affected creatures to take half of the spell's damage. The explosion cannot damage the caster and this cantrip can be used on yourself if you drop to 0 hp. If casted on yourself or a party member, the explosion occurs before any death saving throws are made. This cantrip has no effect on undead creatures.