Wall of Glass

You choose a point on the ground within range and summon a 5ft tall, 30ft long wall of translucent tempered glass. The wall has an AC of 10+spell level, and [roll]8d6[/roll] HP. 

If the wall is between two fixed points that are closer together than 15ft, the wall becomes 10ft tall.

 When the wall is reduced to 0hp, it shatters. Creatures within 5ft of the wall must make a DEX save equal to your spell save DC, or take [roll]3d4[/roll] piercing damage.