Wall of Force

5th-Level Evocation
Casting Time: 1 action
Range: 120 feet
Components: VSM (a pinch of powder made by crushing a clear gemstone)
Duration: (C) 10 minutes

An invisible wall of force springs into existence at a point you choose within range. 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). If a creature would be surrounded on all sides by the wall (or the wall 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 wall.

Nothing can physically pass through the wall. It is immune to all damage and can't be dispelled by dispel magic. A disintegrate spell destroys the wall instantly, however. The wall also extends into the Ethereal Plane, blocking ethereal travel through the wall.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, you may add two additional panels or increase the radius of the dome by 5 feet for each slot level above 5th.

Source: PHB 285, SRD

Changelog

Added upcasting option.
Added option to let a creature make a Dexterity save for a chance to use its reaction to move out of the way if it may get entirely boxed in.