In
TSR/
Wizards of the Coast's
Planescape Campaign Setting for
Dungeons and Dragons, the
modrons are a race of
robots from the
clockwork plane of
Mechanus. They first appeared in
Monster Manual 2, for
Advanced Dungeons and Dragons First Edition, where their home plane was called
Nirvana.
The fifteen ranks of modrons, in increasing order of importance, are:
Base modrons:
Monodrones, the Workers
Duodrones, the Labourers
Tridrones, the Administrators
Quadrones, the Standard, the Sergeants
Pentadrones, the Enforcers
And hierarchs:
Decatons, the Lieutentants
Nonatons, the Comissioners
Octons, the Governors
Septons, the Nuncios
Hextons, the Generals
Quintons, the Mediators
Quartons, the Overseers
Tertians, the Judges
Secundi, the Viceroys
Primus, the One and Prime, supreme lord of Regulus
Any modron who becomes
chaotic and thus a
rogue is translated to the rank of
quadrone and expelled from
Mechanus. Every so many cycles of Mechanus (accounts vary as to how many), a large army of modrons assembles and goes on a sort of pilgrimage right around the
Outer Planes. This event is known as
The Great Modron March, and provides the background for the adventure series of the same name. There are not yet
3e statistics for Modrons, but they are mentioned in the new
Manual of the Planes.