Board Thread:Theories/@comment-27301168-20170507074839/@comment-31641135-20170507133139

Velocity 9 wrote: Well he has berserk,which we have seen and also the titans hardening ability which hange mention while Levi,eren,mikasa,Armin,hange were on a wagon to a certain district maybe episode 4 of this season. it's more specific to his titans special ability yes he does later acquire the hardening power but it's not specific to Eren's titan which is why I think the best option so far is the berserk as that's the only instance we've seen a titan have it so it would make sense that's Eren's special titan power.

Alternatively, we have yet to actually be shown it there's still many possibilities.