Twisted of Mind and Body...
Maloghurst has always been a fan fav character for me since the original Horus Heresy Art Books came out. He was Horus’ equerry, basically an evil Malcador type character. Here’s his Wiki page
In the Dan Abnett he is described as having a broken bent spine deformed by a crash landing, which prevents him from wearing power armor. However, in all the art books and in the Forgeworld Rules he’s in power armor standing upright. My only assumption is that he got more spine surgeries as the heresy went on.
The inspirational artwork I had to go on.