"Iron Man Extremis Armor" is a costume for Iron Man in the Marvel Heroes Game
Iron Man Extremis Armor
Iron Man Vol. 4 #5 (Mar. 2006)
After being put into critical condition in battle with a new enemy, Tony Stark injected his nervous system with the virus known as Extremis in order to save his life. With Extremis, Tony Stark can control the Iron Man armor as if it were a part of him, going so far as to store the armor in the hollows of his bones.