Quadrones were the second most advanced type of base modron.[2]


Quadrones were cube-shaped and winged. They were capable of performing four simultaneous tasks at a time.[2]


Like all modrons, quadrones had an absolute sense of hierarchy and order, and could not be persuaded to disobey their instructions or betray their purpose in any way.[2]

It was possible, however, for a defective quadrone 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.[2]


Quadrones were capable of wielding weapons and were exceptionally proficient with bows, with which they capable of performing four attacks at a time. If destroyed, a quadrone disintegrated completely into dust and a tridrone was instantly upgraded into a quadrone to fill its position.[2]


Like all modrons, quadrones 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.[5]



A rogue quadrone.

Quadrones could communicate with other quadrones and with tridrones and pentadrones. They were incapable of communicating directly with lesser modrons and could not comprehend any of the hierarch modrons, such as decatons.[2]

In modron society, quadrones were responsible for supervising other groups of modrons, as well as performing services as multifunctional laborers.[6] They were always created as the result of tridrones being upgraded to take the place of destroyed or further upgraded units.[2]

There were approximately one and and a half million quadrones in modron society.[7]

Notable QuadronesEdit



The Great Modron MarchTomb of AnnihilationWaterdeep: Dungeon of the Mad Mage
Evil at Baldur's Gate #3
Video Games
Idle Champions of the Forgotten Realms


  1. 1.0 1.1 David "Zeb" Cook (1994). Planescape Campaign Setting, Monstrous Supplement. Edited by David Wise. (TSR, Inc), pp. 16–20. ISBN 978-1560768340.
  2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 Wizards RPG Team (2014). Monster Manual 5th edition. (Wizards of the Coast), pp. 224, 226. ISBN 978-0786965614.
  3. 3.0 3.1 3.2 3.3 Mark Jindra (2001-09-21). The Modrons (Zipped PDF). Wizards of the Coast. pp. 8–9. Archived from the original on 2016-11-01. Retrieved on 2018-09-09.
  4. Gary Gygax (August 1983). Monster Manual II 1st edition. (TSR, Inc), p. 88. ISBN 0-88038-031-4.
  5. Monte Cook, Colin McComb (1997-10-28). The Great Modron March. Edited by Michele Carter. (TSR, Inc.), p. 126. ISBN 0-7869-0648-0.
  6. Mark Jindra (2001-09-21). The Modrons (Zipped PDF). Wizards of the Coast. p. 2. Archived from the original on 2016-11-01. Retrieved on 2018-09-09.
  7. Gary Gygax (August 1983). Monster Manual II 1st edition. (TSR, Inc), p. 86. ISBN 0-88038-031-4.
  8. Christopher Perkins (November 2018). Waterdeep: Dungeon of the Mad Mage. Edited by Jeremy Crawford. (Wizards of the Coast), p. 41. ISBN 978-0-7869-6626-4.


Mechanical Beings of Inherent Order
Base Modrons: MonodroneDuodroneTridroneQuadronePentadrone
Hierarch Modrons: DecatonNonatonOctonSeptonHextonQuintonQuartonTertianSecundus
The One and the Prime: Primus
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