Create Atmosphere

You creates a magically self sustaining atmosphere that provides fresh air for a number of months equal to your caster level. This artificial atmosphere is centered on an object and moves along with it creating an ever present sphere of breathable air in a 3 mile radius around the object. If the object is destroyed the atmosphere remains centered on the largest fragment, or stationary in space if no pieces remain. The spell can not be cast on a creature but can be used to replenish the air supplies of smaller creatures and ships. The air within this atmosphere is always fresh and can not be tainted by fouler air or destroyed by dispel magic.

This spell is inspired by page 70 of the 2e AD&D book titled Spelljammer: Lost Ships by Ed Greenwood.