|• Acid breath|
• Breath attack
"Rust Dragons are known to hunt Gorgons, and live and feed in sulfur mines. With this appetite, Rust Dragons spew a concentrated acid as their primary attack. This acid is capable of eating through the strongest armor, lowering the defense of its target while inflicting further damage." AB manual
Tactics and info
With their incredibly high speed, health, and attack damage, Rust Dragons are generally considered the third strongest creatures in the game, following only Azure Dragons and Crystal Dragons in raw stats.
Acid breath special ability
Acid breath special ability may occur after a stack of Rust Dragons have attacked target creature stack and before the stack has a chance to retaliate. The breath reduces the target stack's defense by 3, and has 30 % chance to cause additional damage amount of 25 points per attacking unit.
Rust Dragons were added in Armageddon's Blade so there are no Rust Dragons or Sulfurous Lairs in Restoration of Erathia. They also prominently appear in the Rust Dragons scenario from the Dragon Slayer campaign in from Armageddon's Blade.
Even though in the game files themselves the Rust Dragon and other neutral dragons are considered to be level 7, the official editor shows they are level 10 (8 for Faerie Dragon). This is either due to code limitations and impossibility of creating a unit with tier higher than 7, either because the developers didn't have time, motivation or reason to add a new creature level in the game code and invest time in that, just telling us they are level 10, respectively 8. As such, even now their levels are still being debated.