Board Thread:Manga/@comment-28516743-20170603033410/@comment-14745711-20170603233414

That would at least not work on the Beast Titan, as he has been shown to be strong enough to break Titan stone, when we he cracked apart the Armoured Titan's Armour and gouged out parts of the Wall. It could work very well against the Armoured Titan though, as you could limit the application of to the joints, which would prevent him from moving, whilst concentrating the hardened skin into a much smaller area, resulting in it being much stronger.

The idea of the blades seems pretty solid, though I imagine Paradis is now leaning more and more towards anti-personal military units to fight Marley. I expect they will turn the Scouts into a kind of elite anti-titan unit. Of course, in order to get the blades Eren would have to be able to make them. Unless of course they can figure out a way to cuts small bits off and shape them into blades, that would allow them to shave excess bits off of previous 'statues' Eren has made to conserve his energy. Though I'm not sure how they'd go about that. Perhaps Eren could make a blade and do it? Plus, in theory they should be able to break the crystal Annie suspended herself in. In fact, it's possible that when Armin taunted Bertolt about them tortouring Annie that he wasn't lying, as Eren has had the armour ability for long enough to try and break the crystal open.