Here's the drawing I made for Steel's helmet, I based it off the night guard helmet and added my own touch to it. For example the face piece was added to keep his identity a secret as well as to keep voice muffled when he talks. Plus the features of the mask was to make it look more intimidating and standout, making it clear to anybody who sees it that he's different then anybody else. Thus making him seem fictional to regular ponies, while also looking like somthing that came out of darkness of some pony's own sole. I hope the drawing I did best represents this. But if you want go ahead and think of your own idea of what the helmet should look like, or add suggestions I could add to the helmet in latter chapters. Until then have a good day.