Coldsteel was hatched in 938. Coldsteel fell in love with his rookery sister Coldfire but she was the mate of his rookery brother Coldstone. He was so jealous that he tried to make Coldstone believe that Coldfire was cheating on him with Goliath. Coldfire managed to convince Coldstone that she was indeed faithful and Coldsteel was banished for his manipulations for one year.
Coldsteel was one of the many gargoyles killed in the Wyvern massacre.
When Demona tried to Coldstone him she used parts of Coldfire and Coldstone bodies as well and three souls soon inhabited the same body.
Coldfire and Coldsteel were given their own bodies by David Xanatos. Coldsteel set off in his new robot body to cause chaos with Coldfire and Coldstone is pursuit.
Coldsteel didn't have an official name till he was placed in the body of Coldsteel. Iago was only used in the script.