Wall of Shadows

You create an impenetrable wall of solidified gloom at a point you choose that you can see. The wall appears in any orientation you choose, as a horizontal or vertical barrier or at an angle. It can be free floating or resting on a solid surface. You can form it into a hemispherical dome or a sphere with a radius of up to 10 feet, or you can shape a flat surface made up of ten 10-foot-by-10-foot panels. Each panel must be contiguous with another panel. In any form, the wall is 1/4 inch thick. It lasts for the duration. If the wall cuts through a creature's space when it appears, the creature is pushed to one side of the wall (your choice which side).

Nothing can physically pass through the wall unless you allow it to. It is immune to all damage except radiant damage. It is vulnerable to radiant damage, however, and any hits to the wall with radiant damage have advantage. When attacked with radiant damage, the wall has AC 15 and 100 hit point. If the wall is reduced to 0 hit points, it dissipates. The wall also extends into the Ethereal Plane and the Shadowfell, blocking travel through the wall via shadows and ethereal means.