And duh that monster has something to do with the military. I mean, A) His name is Sloth, one of the deadly sins. and B) they already showed him digging away in a tunnel much earlier in the series.
Everyone who's read the FMA manga and never seen Brotherhood thought that Hohenheim was a monster at first. I didn't because I know his backstory and his pain. Hohenheim is one of the most pure characters I have seen, he gives me hope.
