Efreeti's Impaling Spear

You summon and hurl a large spear of fire at a creature or object within range, which pierces and pushes the target. A flammable object hit by this spell ignites if it isn't being worn or carried.

Make a ranged spell attack against the target. On a hit, the target takes 2d10 force damage immediately and must succeed on a Strength saving throw or be pushed back 20 feet in a straight line. If a creature impacts an object as part of this movement, it takes 2d6 bludgeoning damage and is restrained by the spear until the spell ends. 

At the start of its turn, a creature impaled by the spell takes 2d4 fire damage. It may use its action to make a Strength check against your spell save DC. On a success, it frees itself.

At Higher Levels. For each spell slot level above 4, increase the initial damage by 1d10, the impact damage by 1d6, and the fire damage by 1d4.

Make Way. If the creature impacts another creature during the pushback, the second creature must succeed on a Strength saving throw against your spell save DC. If it fails it falls prone in the nearest free space within 5 feet from the impact.