Decatons (pronounced: /ˈdɛkɑːtɑːnzDEK-a-tanz[5]) were the lowest rank of hierarch modrons.[4]


Decatons were shaped like spheres atop stubby legs, with ten tentacles and four eyes evenly spaced around the sphere. At the top of the sphere was a mouth.[2]


If forced into combat, a decaton used its tentacles in melee combat. They also heavily relied on their spellcasting abilities.[2]


Like all hierarch modrons, decatons had the innate ability to duplicate the effects of clairaudience, clairvoyance, command, dimension door, teleport without error, and wall of force spells at will. Additionally, they were able to cure injuries and cure diseases from all modrons within 144 ft (43.9 m) and 12 ft (3.7 m), respectively. They could also heal and remove paralysis by physically touching another modron.[6]


There were only 100 decatons in modron society.[4] They could communicate with other decatons and with nonatons, and relayed their orders to pentadrones. One decaton was in charge of each of the 64 sectors of their realm in Mechanus, and the remaining 36 decatons served in the modron armies. They functioned as caretakers of the modrons under their command and could communicate telepathically with anyone in a 44-mile (71 km) radius.[2][4]

Decatons were always created as the result of pentadrones being upgraded to take the place of destroyed or further promoted decatons.[7]


Decatons were able to fly by generating a lifting gas that allowed it to be lighter than the surrounding air. Decatons were able to communicate telepathically with any sentient creature within 405 mi (652 km) and could see in darkvision up to 44 ft (13 m).[2]


Around −346 DR Netherese archmage and explorer Lady Polaris came upon Mechanus and the modrons. She summoned several decatons to her home to guard her treasures, but was stymied as they kept disappearing after several days. She had more success with the pentadrones she focused on next.[8]




The Great Modron March
Video Games
Idle Champions of the Forgotten Realms

External LinksEdit


  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. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Mark Jindra (2001-09-21). The Modrons (Zipped PDF). Wizards of the Coast. pp. 10–11. Archived from the original on 2016-11-01. Retrieved on 2018-09-09.
  3. Gary Gygax (August 1983). Monster Manual II 1st edition. (TSR, Inc), p. 89. ISBN 0-88038-031-4.
  4. 4.0 4.1 4.2 4.3 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.
  5. Frank Mentzer (January 1985). “Ay pronunseeAYshun gyd”. In Kim Mohan ed. Dragon #93 (TSR, Inc.), p. 26.
  6. Monte Cook, Colin McComb (1997-10-28). The Great Modron March. Edited by Michele Carter. (TSR, Inc.), p. 126. ISBN 0-7869-0648-0.
  7. Mark Jindra (2001-09-21). The Modrons (Zipped PDF). Wizards of the Coast. pp. 2–3. Archived from the original on 2016-11-01. Retrieved on 2018-09-09.
  8. slade (1996). How the Mighty Are Fallen. (TSR, Inc), pp. 3, 31. ISBN 0-7869-0537-9.


Mechanical Beings of Inherent Order
Base Modrons: MonodroneDuodroneTridroneQuadronePentadrone
Hierarch Modrons: DecatonNonatonOctonSeptonHextonQuintonQuartonTertianSecundus
The One and the Prime: Primus
Community content is available under CC-BY-SA unless otherwise noted.