Accelerate decelerate field.

Select a rectangular area within range. The metal shavings fly to the location and denote it. The rectangle is 5 ft wide and 30 ft long. Once the rectangle is placed choose a direction. Any projectiles passing through the rectangle in the chosen direction get advantage on attack and damage rolls, while anything passing opposite get disadvantage. This area counts as rough terrain when moving opposite the direction and takes no movement when moving with.