Reveal Invisible

This spell creates a sphere that no one can see. Invisible beings and objects within the sphere are clearly revealed to all observers. Naturally invisible, magically invisible, and psionically invisible creatures and objects are revealed. The sphere has no effect on other illusion/phantasm magics, however; it won't by itself reveal extraplanar, out-of-phase, or displaced creatures-unless they are invisible.

The caster can move the sphere 30 feet horizontally and 10 feet vertically per round. Many casters choose to center the area of effect on themselves, and then will it to remain there, allowing the sphere to move with the caster. The caster must decide where the spell is centered at the time of casting, and cannot change this later.

No saving throws are allowed against this sphere, although it is destroyed instantly if the caster is slain or loses consciousness. An invisible being or object returns to invisibility when the reveal invisible spell expires or when the area of effect moves on.