User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6040659-20131209012335/@comment-5043481-20131209233455

It is my belief that deviljho hide is thick and leathery enough to prevent most attacks from causing major damage beneath it. Exceptions would be blunt force damage from durams, diablos and uragaan, which it would offer little if any protection from. I think even a diablos stabbing jho with its horns would not cause major damage unless inflicted in a weak spot. But damage none the less, hence all the scars. Most are probably no more than scratches to the brute wyvern.

Just because deviljho is not covered in a hard shell does not mean he isn't well defended.