"Extremis" is a six-issue story arc from the comic book series Iron Man, published in issues one through six in 2005 and 2006 by Marvel Comics. It was written by Warren Ellis and illustrated by Adi Granov. Extremis elevates the status quo for Iron Man, increasing the power of his armor significantly.
Extremis received mostly positive reviews, and it is often listed as one of the best Iron Man stories. From Wikipedia
