Fire-breath
Fire-breath is an ability that several Transformers with reptilian beast modes have installed in themselves for combat in their alt modes.
Fiction
Generation 1
Cartoon continuity
The Dinobots had fire-breath included in their alternate modes. Although they all possessed the ability, Grimlock and Slag were the only ones that really employed it. Slag used his fire-breath to help repair the Washington Monument, Atlantis, Arise! and Wheeljack had Grimlock demonstrate his mastery of his fire-breath by adjusting Blaster's volume levels. Later, while practicing on Dinobot Island, Grimlock had Slag practice his "fire stuff" (Grimlock's words) by evaporating a pond. Slag displayed good moves. The local wildlife was not amused. Dinobot Island, Part 1 Later, Slag's fire-breath saved the Dinobots by evaporating the tar pit they had sunken into, but it made him rather tired. Dinobot Island, Part 2
During the brawl among the Primitives, Grimlock showed the upity Decepticons not to insult him by unleashing his fire-breath upon them. The Decepticons hit started to cough...cause that's what happens when you get him with fire that can melt body armor. Call of the Primitives It may be possible that Grimlock deliberately turned down the power of his breath, wishing only to subdue the Decepticons (since at the time he was allied with them), but a) this is only speculation, and b) Grimlock isn't that smart (or at least wasn't in the G1 cartoon).
The Monsterbots also had fire-breath, based on their toys' gimmick to fire "cold" sparks. Head Formation of Friendship The Decepticon Emperor of Destruction Deathsaurus made use of fire-breath in at least one battle with his hated rival Star Saber. The Tide is Turned! The Ultimate Weapon, the Victory Unification
Toy bios
As a point of fact, Slag's very function is "flamethrower".
Beast Wars
After becoming a Transmetal 2 dragon, Megatron possessed a new ability called "Blast of Flame"[1], in one word, fire-breathing. He was also capable of shooting sub-zero blasts which were called "Blast of Cold".[1] Megatron likes to keep his enemies on their toes. Yessss... Master Blaster
Robots in Disguise
Megatron's dual-headed dragon mode possessed an attack named Twin Dragon Breath, which consisted of fire-breath. He first used it on Rail Racer after Team Bullet Train saved the Linear RFG. Bullet Train to the Rescue Gas Skunk's acid breath was once ignited by Railspike, giving him fire-breath for a few minutes, much to his alarm. He chased Slapper and Dark Scream around until he ran out of fuel. The Secret of the Ruins
Cybertron
Scourge's Cyber Key weapon was a pair of smaller dragon heads capable of breathing fire. This attack caused severe damage to Overhaul in their first battle.
Animated
Megatron had fire-breath installed in the Dinobots, intending to unleash it against the humans and Autobots. When Isaac Sumdac confronted him about its presence, Megatron claimed that his desire to have a body once more compelled him to experiment by installing the fire-breath as one of several "features". Sumdac bought it hook, line, and sinker. Blast from the Past
