The Oculus Vigilans (sometimes called a Sentinel Eye) is an unusual member of the oculus family, for unlike the others they are not hateful nor voracious. One appears like most oculi, being a spherical body with a single large eye, a mouth below it (though in the case of this species the mouth points almost downward), and between 3 and 6 (1d4+2) eyestalks. The eyestalks are arranged starting near where a humanoid might have an ear, then proceeding up and over the main body in an evenly-spaced line ending with the last eye stalk where a humanoid’s other ear might be. They are pale gray in overall coloration, sometimes tinged faintly with green or blue.

These creatures come from another plane of existence, and are summoned or otherwise compelled to service by powerful wizards or priests. They will be assigned to guard some location or treasure, but do not have (nor care to have) any of their own. They are normally faithful to whatever bargain they have made, but if one is blinded in all its eyes it will return to its own plane, disappearing instantly as its next action in combat.