But the cities were here with their drum-beaters, as the commissioner seemed to be setting expansion machinery in motion.

Opposing Force was received favorably by critics, many citing the game as being as influential on setting expansion pack standards as the original game had been in influencing the overall genre.

Formians were later expanded upon by the Planescape campaign setting expansion Planes of Law, in which they were described as one of the primary inhabitants of the plane of Arcadia, the Outer Plane of borderline Lawful Neutral/Lawful Good alignment.