Crystalline Barrier

A nonmagical panel of opaque crystal springs into existence at a point you choose within range. The panel is 1 inch thick and is composed of one 10-foot-by-10-foot panel. 
If the panel cuts through a creature’s space when it appears, the creature is pushed to one side of the panel that they choose. 
The panel doesn’t need to be vertical or rest on any firm foundation. It must, however, merge with and be solidly supported by existing stone. Thus, you can use this spell to bridge a chasm or create a ramp.
The panel is an object made of crystal that can be damaged and thus breached. The panel has AC 14 and 30 hit points per inch of thickness. Reducing the panel to 0 hit points destroys it.
If you maintain your concentration on this spell for its whole duration, the panel becomes permanent and can’t be dispelled. Otherwise, the panel disappears when the spell ends.

At Higher Levels. If you cast this spell using a spell slot of 3rd level or higher the panel can be made to be an extra inch for every level above 2nd.