Ritual of Circle Binding

Casting Time: 10 minutes
Duration: 1 hour
Material Component:  a complete circle up to 15ft wide

At the completion of this ritual an invisible cylinder of force springs into existence drawn over the circle you have laid out. The cylinder is twice as tall as it is wide and sealed at the top and bottom. The dome's walls are 1/4 inch thick. If a wall cuts through a creature's space when it appears, the creature is pushed to one side of the wall (your choice which side). A creature within the cylinder cannot physically pass through the wall or effect anything beyond the wall. The wall 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.

If at any time the circle at the base of the dome is broken, this ritual ends. A disintegrate spell destroys the wall instantly.