Eye of Kilrogg (Warcraft II)

The Ogre-Mage creates a free-floating apparition in the form of a disembodied Eye that he can then direct through the air to look down upon enemy forces and encampments. Named for the great leader of the Bleeding Hollow clan, this ever vigilant Eye transmits its view to the caster, giving him the knowledge of both the lands it wanders and those creatures who live there. The Eye will vanish after a time, leaving the Ogre-Mage with the knowledge of the terrain.