Primus

Primus is the ruler of all the modron realm. It and it alone understands the whole structure of the modron race, since it sits at its pinnacle. From there it decrees what is order, writes the laws, and establishes the rules and regulations. All other modrons exist to carry out the plans and obey the rules of Primus. Failure to meet this powerful creature's standards will result in a modron being declared rogue and sentenced accordingly.

Primus is a huge being who rises from an energy pool in the central part of its great tower at the center of the plane (although Primus also may appear as a normal androgynous human). In giant form Primus's hands are unseen, for the right one is swathed in bright rainbow hues and the left is covered with inky dark clouds.

Within Mechanus, Primus has the status of a greater power. Its sole concern is for the modrons. It does not send avatars to other planes or even take part in the normal bickering and wars of the planar powers. All modrons with priestly powers gain their spells directly from it.

Note: Primus originally appeared in this form in the Planescape AD&D campaign setting from TSR. Its use here is for the purposes of providing context for the campaign only.