Eclipse

An illusion of the full moon appears and blocks the light of the sun.  A region of 1 mile radius around the caster is plunged into darkness, lowering the light level to dim light.

 A chill in the air fills this area, and all creatures within this area have vulnerability to cold damage.

 If cast indoors, an image of the moon will appear on the ceiling and illuminate the area in a dim blue/white light.  This can illuminate a cavern or large room up to 1 mile radius around the caster in dim light.  This area still creates vulnerability to cold damage.