It could be that the steel dragon was challenged by a rust dragon. A huge winged shape can be found lying under a collapsed building, but local legends disagree on its significance:
  • The steel dragon was victorious and carried the few survivors of the city to some distant land, leaving behind the corpse of the rust dragon.
  • The rust dragon won and turned the corpse of the steel dragon into a nest of rust monsters. It will one day return to see the nest's progress.
  • The rust dragon fell into a deep slumber after eating the steel dragon. Fear it waking up to defend the vast corroded hoard it sees the city as.