Continuous Fog Cloud

You create a 1 mile-radius sphere of fog centred on the ritualistic item.  The sphere spreads around corners, and its area is heavily obscured. It lasts for the duration or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.  The fog will slowly begin to re-incorporate itself after a period of 1 minute, returning to full obscurity after 5 minutes.  You can designate areas not effected by the fog when the spell is cast, but the designated areas must be either a sphere, cone or cuboid and must not be more than 50% of the spells coverage.

The castor can determine the thickness of the fog when cast, Partial, Heavy or Dense.  Either way it effects all creatures within the domain of the spell.

The spell lasts until dismissed with a command word and touch, the ritualistic item is destroyed, or with Dispel Magic .

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the radius of the fog increases by .2 cubic miles for each slot level above 4th.