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A rust monster was a creature that corroded and ate metal.[6] They were favored by the Mulhorandi god Geb, the dwarven god Abbathor, the gnomish god Flandal Steelskin, and the Duergar gods Laduguer and Deep Duerra.[7]

Destroyed me hammer and me axe, it did. Put me faith to the test that day, it did.
— Brawn Thunderstones, dwarf paladin of Dumathoin[1]


A rust monster was the size of a small pony, with four insectlike legs and a squat, humped body. Its hide was thick and lumpy and was yellowish tan on the belly and rust-red on the back. Its tail ended in what looked like a double ended paddle. Two long antennae come out of its head, one under each eye.[6]


Normally a docile creature,[1] a rust monster could smell metal from ninety feet away. They always went for the biggest source of metal first, and preferred ferrous metals over precious ones.[6]


A rust monster had a weak bite and did not normally attack with it.[6] They attacked anyone who had metal, however, with their antennae. The touch of an antenna could turn even magical metal items into rust.[6]


Rust monsters ate the rust of freshly rusted metal objects.[6]

Some sages speculated that rust monsters might be related to or the larval form of rust dragons[8] The extremely few rust monsters who lived long enough to reach old age somehow transported themselves to the plane of Acheron, where they ravenously consumed the abundant metal from the plane's cubes for about one year. Afterwards, they encased themselves in cocoons made of spun metal, where they stayed for three years. Following this period, they emerged from their cocoons as rust dragon wyrmlings.[9]

It was not known, however, whether rust monsters were native to Acheron and only traveled to the Prime Material plane as a part of their larval cycle to become rust dragons, or if rust monsters were in fact native to the Prime and were altered by the magic of Acheron once transported there.[9]

Rust monster antennae were used in the creation of rust blades. They found these items extremely delicious and nourishing.[10]




Further reading[]


  1. 1.0 1.1 1.2 1.3 Mike Mearls, Jeremy Crawford, Christopher Perkins (2014-09-30). Monster Manual 5th edition. Edited by Scott Fitzgerald Gray. (Wizards of the Coast), p. 262. ISBN 978-0786965614.
  2. Rob Heinsoo, Stephen Schubert (May 19, 2009). Monster Manual 2 4th edition. (Wizards of the Coast), p. 178. ISBN 0786995101.
  3. Skip Williams, Jonathan Tweet, Monte Cook (July 2003). Monster Manual v.3.5. (Wizards of the Coast), p. 216. ISBN 0-7869-2893-X.
  4. 4.0 4.1 4.2 4.3 4.4 David "Zeb" Cook, et al. (1989). Monstrous Compendium Volume Two. (TSR, Inc). ISBN 0-8803-8753-X.
  5. Gary Gygax (December 1977). Monster Manual, 1st edition. (TSR, Inc), p. 83. ISBN 0-935696-00-8.
  6. 6.0 6.1 6.2 6.3 6.4 6.5 Skip Williams, Jonathan Tweet and Monte Cook (October 2000). Monster Manual 3rd edition. (Wizards of the Coast), p. 216. ISBN 0-7869-1552-1.
  7. Sean K. Reynolds (2002-05-04). Deity Do's and Don'ts (Zipped PDF). Web Enhancement for Faiths and Pantheons. Wizards of the Coast. pp. 10–15. Archived from the original on 2016-11-01. Retrieved on 2018-09-08.
  8. Andy Collins, James Wyatt, and Skip Williams (November 2003). Draconomicon: The Book of Dragons. (Wizards of the Coast), pp. 186–187. ISBN 0-7869-2884-0.
  9. 9.0 9.1 Colin McComb, Dori Hein (February 1995). “Monstrous Supplement”. In Dori Hein ed. Planes of Law (TSR, Inc), pp. 28–29. ISBN 0786900938.
  10. Ed Greenwood (May 1991). “Bazaar of the Bizarre: A dozen deadly daggers from the Forgotten Realms”. In Roger E. Moore ed. Dragon #169 (TSR, Inc.), pp. 88–92.