Under the heat of the sun, a priest can cause an illusory image exactly like the 1st level wizard spell phantasmal forte. The spell can be cast only in bright sunlight. It creates the illusion of any object, creature, or force within the boundaries of the spell's area of effect. This is a cube, 10 feet on a side per level of the caster. Thus, a 3rd level priest can create a mirage in a 30-foot by 30-foot area with a height of 30 feet as well. The illusion is visual; the spell does not create sound, smell, or temperature. The mirage instantly disappears if touched, or if the caster ceases concentration. The mirage can be moved by the caster within the area of effect.
The reverse, reveal mirage, reveals things as they really are, negating natural or magical mirages.
Notes: Uncommon for priests of the Dark Sun setting; otherwise, very rare.