It was only natural that the process of clearing the Deep Wall Stratum was not as easy as the forum post title suggested.
While it was just a descent overall speaking, Edward encountered something unexpected as he attempted to fly through the entire tunnel on his Blackfire Dragon.
First and foremost, the Nine-headed Birds and other monsters living in this stratum would attack him—although it was not too fierce and manageable for Edward, guarding against the attack still drains his strength.
But there was a bigger problem after dealing with the creatures' attack.
