concentration, 5 minutes/mana
As two actions, an invisible wall of kinetic energy twice as big as normal springs into existence at a point within 20 meters that lasts for the duration. The wall can’t occupy the same space as a creature or object and doesn’t need to be vertical or rest on any firm foundation.
If a creature would be surrounded on all sides by the wall (or the wall and another solid surface), that creature can make a Reflex 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.
The wall is weightless and 1 centimeter thick and each panel of the wall has 15 Defense, 100 Health, and is immune to bludgeoning, necrotic, piercing, poison, and slashing damage. Reducing a panel to 0 health destroys it and might cause connected panels to collapse at the GM’s discretion.
Nothing—not physical objects, energy, or other spell effects—can pass through the barrier, in or out, though a creature in a sphere can breathe there. A creature or object inside can’t be damaged by attacks or effects originating from the other side.
You can size the wall to be just large enough to contain the creature or object inside. A creature enclosed in a spherical wall can use an action to push against the sphere’s walls and thus roll the sphere at up to half the creature’s speed. Similarly, a spherical wall can be picked up and moved by other creatures.
A disintegrate spell targeting the wall destroys it without harming anything inside it.
You can expend 1 additional mana to change the duration to 1 hour/mana and a creature trapped inside the wall can’t leave it by nonmagical means. If the creature tries to use teleportation or interplanar travel to leave the wall, it must first make a Will saving throw.
On a success, the creature can use that magic to exit the cage.
On a failure, the creature can’t exit the cage and wastes the use of the spell or effect. The cage also extends into the Ethereal Plane, blocking ethereal travel.