Air Blade

When this attack is used, a large blast of green wind is shot in a straight line toward the target, damaging everything in its path until it passes away from the battlefield.  All creatures in a 120 line must make a dex save or take on a fail 3d10 + your spellcasting modifier slashing damage. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 for each slot level above 5th.