Earth strike

A filthy line of rocks, sand and local debriese rushes toward a creature within range. Make a ranged spell attack against the target. On a hit, it takes 4d8 bludgeoning, piecing and slashing damage, and any creature within 5ft (including the target creature) Speed is reduced by 10 feet until the start of your next turn.

On a critical hit the target creature and any creatures within 5ft of the target creature are knocked prone.