Planescape: Dark Mirrors
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There are at least 81 nonaton posts identified in modron society, and there may be more. These cylindrical modrons act as commissars and chief inspectors of the modron universe. Nine nonatons carry the orders of the octons, 64 regulate the actions of the decatons on the 64 wheels of the realm, and eight monitor the loyalties of the decatons of the army. Each nonaton has ten decaton lieutenants, who in turn have five pentatons to serve them.
Nonatons have the spell powers of 11th-level clerics, plus the following spell-like abilities, usable at will, once per round: ESP, mirror image, slow, web, detect good/evil, detect lie, and detect charm. They may use power word, stun once per day.
Nonatons usually head investigations of rogue modron units and handle small-party invasions from other planes. In the latter case, they first attempt to detect the invaders’ intentions, then act accordingly.