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Duodrones (pronounced: /ˈddrɒnzDOO-o-dronz[6]) were the second simplest type of modron.[1]


Duodrones were block-shaped constructs,[1][7][3] with two spindly arms, two spindly legs, a small set of wings, a central eye, and a large mouth.[3]


Like all modrons, duodrones had an absolute sense of hierarchy and order, and could not be persuaded to disobey their instructions or betray their purpose in any way.[1]

It was possible, however, for a defective duodrone to go rogue and start acting in its own interests or no longer in accordance with its instructions, sometimes even becoming violent. Such rogues were relentlessly hunted by other modrons, although, unlike their properly operating fellows, they could be reasoned with.[1]


If ordered to attack, duodrones would continue fighting until they or their enemy was destroyed.[3] Duodrones were capable of wielding weapons—often halfspears[3]—and were competent combatants, capable of performing two attacks at a time. If destroyed, a duodrone disintegrated completely into dust, and a monodrone was instantly upgraded into a duodrone to fill its position.[1] If victorious, unlike a monodrone, a duodrone could then decide whether or not to pursue additional combatants.[3]


Duodrones were capable of two tasks at a time. Unlike the more limited monodrones, they were fully capable of communicating in their own language of clicks and whirs.[1][7][3]

Like all modrons, duodrones were immune to all effects and spells that influenced the mind, fear and attacks that rely on energy from either the Negative or Positive energy planes. They also had a resistance to acid, cold and fire.[8][3]


Duodrones could communicate with other duodrones and with monodrones and tridrones. They were incapable of comprehending more advanced modrons.[1]

In modron society, duodrones were responsible for supervising units of monodrones.[1][3] They were always created as the result of upgraded monodrones to take the place of destroyed units.[1] They followed the orders given to them by the tridones.[3] Typically, though they could perform two tasks at once, they were only given one, so that it would have the ability to react to an unforeseen circumstance.[3]

In the modron army, duodrones served as corporals, sergeants, or special shock troops, often leading squads of exactly twelve monodrones.[3]

It was estimated that there were over 55 million modrons in the duodrone caste.[9]


Sometime in the late 1480s DR, a duodrone that was part of a group of modrons that were stranded in the Underdark was held prisoner in the Wormwrithings. The duodrone had been captured by Karazikar, who hoped to learn information about the Maze Engine.[7]



Out of the Abyss[7]The Great Modron March
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  • One of their first miniatures was in the Tomb of Annihilation set in 2017


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 Mike Mearls, Jeremy Crawford, Christopher Perkins (2014-09-30). Monster Manual 5th edition. Edited by Scott Fitzgerald Gray. (Wizards of the Coast), pp. 224–225. ISBN 978-0786965614.
  2. Brian James (August 2012). “The Ecology of the Modron”. In Steve Winter ed. Dragon #414 (Wizards of the Coast), p. 12.
  3. 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 Mark Jindra (2001-09-21). The Modrons (Zipped PDF). Web Enhancement for Manual of the Planes 3rd edition. Wizards of the Coast. p. 7. Archived from the original on 2016-11-01. Retrieved on 2018-09-09.
  4. 4.0 4.1 David "Zeb" Cook (1994). Planescape Campaign Setting, Monstrous Supplement. Edited by David Wise. (TSR, Inc), pp. 16–19. ISBN 978-1560768340.
  5. Gary Gygax (August 1983). Monster Manual II 1st edition. (TSR, Inc), p. 87. ISBN 0-88038-031-4.
  6. Frank Mentzer (January 1985). “Ay pronunseeAYshun gyd”. In Kim Mohan ed. Dragon #93 (TSR, Inc.), p. 26.
  7. 7.0 7.1 7.2 7.3 Christopher Perkins, Adam Lee, Richard Whitters (September 1, 2015). Out of the Abyss. Edited by Jeremy Crawford. (Wizards of the Coast), p. 177. ISBN 978-0-7869-6581-6.
  8. Monte Cook, Colin McComb (1997-10-28). The Great Modron March. Edited by Michele Carter. (TSR, Inc.), p. 126. ISBN 0-7869-0648-0.
  9. Mark Jindra (2001-09-21). The Modrons (Zipped PDF). Web Enhancement for Manual of the Planes 3rd edition. Wizards of the Coast. p. 2. Archived from the original on 2016-11-01. Retrieved on 2018-09-09.


Logical Beings of Law and Order
Base Modrons: MonodroneDuodroneTridroneQuadronePentadrone
Hierarch Modrons: DecatonNonatonOctonSeptonHextonQuintonQuartonTertianSecundus
The One and the Prime: Primus