4 INTERESTING THEORIES ABOUT HOW ATTACK ON TITAN WILL END

*Season 2 and manga spoilers ahead!*

1. Eren will eat all the spinal fluids of the other Titan Shifters, before crystallising himself

   
   (Theory credits to Curiously Programmed that can be read here)

2. This theory then uses the same idea of Eren crystallising himself, but elaborates a bit more on it

   
   (Theory credits to @ackersman)

3. A variation of the above theory is that Eren will actually sacrifice himself to Historia, as only a member of the royal family can really undo all the harm that’s been caused throughout history to humanity. This way Historia will have the power of the coordinate and will be able to destroy the walls. Though she too will most likely have to sacrifice herself to rid the world of the Power of the Titans…

   
   (Theory credits to @Tripper511)

4. Another theory is that once Eren has all 9 shifter powers, Ymir Fritz will return (as her soul was split into the 9 Titan powers). So once all the powers rejoin, Ymir will be reborn and will return the shifter powers to the ‘power of the source of all organic material’ to where it belongs. This will free humanity from Titans and Ymir’s curse

   
   (Theory credits to @Ann Mary John)