This story is a sequel to Antipodes
Several decades after the heroic actions of Jigsaw, Tiptoe, and Incendia restored the princesses, the world has begun the slow process of healing. Spectrum is a headstrong young stallion from Totemhoof who signs up with an excavation team in the hopes of experiencing a life changing adventure. What he finds will send him into a head-on collision with forces he can't begin to comprehend- and, perhaps, a chance to fulfill his destiny.
Sequel to Antipodes- though you don't need to have read it to enjoy this, I hope.
AKA An2podes