Unlike other earth ponies, who'd much rather be safe within the walls than to be titan fodder, Rein wants to feel the freedom of traveling beyond his sanctuary. But, he didn't possess the same abilities unicorns or pegasi had.

It's kinda hard to tell, but Pinkie Pie has a deep desire for you.

Long ago, a young earth pony named Navin would embark on an epic journey to stop another bloody war from reaching its climax.