Blade barrier

Blade barrier was an evocation spell that summoned a ring of spinning blades.

Effects
This spell created a spinning disk of razor-sharp blades. These whirled and flashed around a central point, creating an immobile, circular barrier. Any creature passing through the Blade Barrier suffered serious injuries that increased in severity with the power of the caster. The plane of rotation of the blades could be horizontal, vertical, or slanted.

Creatures within the Blade Barrier when it was invoked were injured as well. Agile creatures could avoid injury by dodging the blades and immediately leaving the area of the spell's effect. Once the barrier was in place, anything entering or passing through the blades was automatically injured.

A blade barrier provided some protection from attack for anyone beyond it.