Boom blast

You hurl a unstable matter of fire and ice at a creature or object within range. Make a ranged spell attack against the target. On a hit, the target takes 1d8 force damage. the target must make a STR saving throw (DC10) or is knocked prone on fail, on succes he stays upright. unsturdy objects can be blown to pieces and fly back depending on the weight

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).