Iron Dragon

A metal Dragon with giant wings and the ability to breathe fire.

As it draws near, you see that it is no ordinary Dragon, if any Dragon could be considered “ordinary.” It is half flesh and half iron. Even its wings are metallic, bearing a strange arsenal of weaponry unlike any you have ever seen. - Tome of Encounters (RPA-SQ1)

The Iron Dragon is outfitted with destructive armaments on its metal parts;

A metal projectile fires from its wing, creating an explosion forceful enough to bring down one of the walls of the arena. The crowd screams as members of the audience are torn apart or blown into ashes. - Tome of Encounters (RPA-SQ1)

Iron Dragons are powered by life-crystals, often installed in the nape of their necks;

…you clamber quietly up to open the back of the Dragon’s neck. You’re thrilled to discover the life-crystals still in their sockets. - Backstory Codex - Artificer (RPA-BC)

When faced by an Iron Dragon at the Colosseum of Ashes it instead turns its attention to laying waste to the stadium:

• Rally the guards to fight together against the Iron Dragon.
• Tend to the audience and save as many of its members as you can.

Following the battle the Colosseum is in need of repairs;

Teams of laborers are hard at work repairing the damage done to the Colosseum after the Dragon’s attack on the crowd. Entire sections of the amphitheater's tiered seats are still black from the Dragon’s fiery breath. - Tome of Encounters (RPA-SQ1)

An Iron Dragon hangs in the Great Hall of Sabek Palace;

The full body of an Iron Dragon stands here among Taron’s other trophies. The Dragon isn’t a Construct, but the Dragul did use something similar to build it. - Backstory Codex - Artificer (RPA-BC)