Backblast

You release a blast of magical energy, damaging and knocking back nearby creatures. Each other creature within 5 feet must succeed at a Strength saving throw or be pushed 10 feet in a straight line directly away from you. If the space a creature would move into is blocked or occupied, they and whatever blocked further movement each take 1d4 bludgeoning damage.

Huge and Gargantuan creatures are moved half the distance but still take the same damage from a collision.

Cantrip Upgrade. The distance increases by 10 feet and the collision damage increases by 1d4 at levels 5 (20 ft., 2d4), 11 (30 ft., 3d4), and 17 (40 ft., 4d4).