The Iron Man Armor Model 30 (Model XXX), famously known as the Extremis Armor, was an armor that appeared in the Extremis Story Arc of the Iron Man Comics, within the Marvel Comics Universe, that was published and created by Marvel Comics. It was created by Tony Stark, and uses a nanotechnology called Extremis that is connected to Tony's brain as well as uses a special piece of tech that can be stored in his bones, called the Undersheath.