Vanquishing Lance

With a thunderous boom that is audible out to 300 ft, you magically propel the projectile in a direction of your choice in a line 150 feet long and 5 feet wide.
Make a ranged spell attack against each creature within the affected area . On a hit a creature takes 8d8 piercing damage and 4d8 fire damage, or only the fire damage on a miss.
Each creature hit after the first, takes only half the piercing damage.
The projectile penetrates most surfaces without resistance, only being stopped by unusally hard or dense materials or a wall thicker than 15 feet

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, both the fire and piercing increase by 1d8 for each slot level above 5th.