Wyran's Unleash Missiles

You open a portal to a distant battlefield and let loose a barrage of ballistics. Choose a point within 60 feet, a portal opens their and unleashes a stream of arrows in a line 30 feet long and 5 feet wide. You choose which direction the portal faces when you open it. All creatures in the line must make a Dexterity saving throw, on a failure a creature takes 4d6 magical piercing damage, on a success a creature takes half damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.