Crystal Palisade

A magical palisade of solid crystal forms into existence at a point you choose within range. The palisade is 10 inches thick and is composed of ten 10-foot- by-10-foot panels. Each panel must be adjoining with at least one other panel. Alternatively, you can create 10-foot-by-20-foot panels that are only 5 inches thick.

If the palisade cuts through a creature's space when it appears, the creature is pushed to one side of the palisade (your choice). If a creature would be surrounded on all sides by the palisade (or the palisade and another solid surface), that creature can make a Dexterity saving throw. On a success, it can use its reaction to move up to its speed so that it is no longer enclosed by the palisade.

The palisade can have any shape you desire, though it can't occupy the same space as a creature or object. The palisade doesn't need to be vertical or rest on any firm foundation.  Thus, you can use this spell to bridge a chasm or create a ramp. If you create a span greater than 20 feet in length, you must halve the size of each panel to create supports. You can crudely shape the wall to create crenelations, battlements, and so on.

It however can not be created on a liquid surface. Any attempt to do so will still bring the palisade  into existence but will immediately, upon creation, fall through the liquid if it's deep enough.  

The palisade is an object made of crystal that can be damaged and thus breached. Each panel has AC 15 and 40 hit points per inch of thickness. Reducing a panel to 0 hit points destroys it and might cause connected panels to collapse at the GM's discretion. The destroyed panels shatter and leave behind jagged debris that causes that area to become hazardous terrain. The palisade is immune to non-magical fire, and resistant to Lightning and Radiant damage. 

The palisade  is initially clear but with a faceted interior, Any attempt to cast through the wall with any visual based spells is at disadvantage. The caster of the Crystal Palisade spell has the option to spend an action to cause the palisade  to become opaque, thus preventing anyone from either side of the palisade  from seeing through it.

If you maintain your concentration on this spell for its whole duration, the palisade becomes permanent and can't be dispelled. Otherwise, the palisade shatters into crystal dust and disappears when the spell ends

At Higher Levels. If you cast this spell using a spell slot of 6th level or higher, the number of panels is increase by 2.