Water Geyser

A stream of water spouts from your hand in a 30ft line. Roll to attack on the first creature in the line, on hit the target takes 1d8 bludgeoning damage and must make a strength save. On a failure, the target is pushed 10 feet back. 

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8). In addition, the stream hits an additional target further in the line when you reach 5th level (2 targets), 11th level (3 targets), and 17th level (4 targets)