Shortly after the invocation, a magical mist manifests directly above the caster, emitting lightning and creating a magical tension. The storm grows at a rate of one meter per combat round to a size of Power*5 meters, and can be controlled by the caster.
In the magical storm, each magic adept suffers one wound per combat round. In addition, no spellcaster is able to perform a magical action in the storm. Those not skilled in magic do not suffer any limitations.
The storm can be controlled at a speed of two meters per second. This control requires the caster to remain focused on the spell, which is not otherwise necessary.