(This is within the Rumbling also pick any character that is still alive during this time :D)

Terror strikes down on humanity when Eren Yeager transforms into the Founding Titan after his head got shot off of him...all the walls fall apart and the wall titans come out and trample over all the innocent people as they follow their leader, Eren Yeager...while on the side of this the little part of the scouts that are still alive have to find out a way to stop the Rumbling and Eren from killing all of humanity and saving Eldia