Volcanic Smite

The edge of your weapon becomes cased in shards of hot volcanic rock. The next time you hit a creature with a weapon attack before this spell ends, the volcanic shards explode over the target. The attack deals an extra 2d6 fire damage and 2d6 piercing damage to the target. If the target is a creature or flammable object, it ignites. Until a creature uses an action to douse the fire, the target takes 1d6 fire damage at the end of each of its turns.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the extra fire and piercing damage increases by 1d6 for each slot level above 3rd.