Twilight Sparkle and Rainbow Dash find themselves drawn by the call of the cutie map to a jungle in the middle of nowhere. Drawn further by the knowledge of an ancient temple, they are confronted with icy cold and a sense of dread.
Far from Canterlot and forced to work in gem mines for cruel Diamond Dogs, a young unicorn named Bone Marrow's pursuit of his cutiemark reveals a unique talent: raising the dead.