Deep within the fey-touched steppes of the Everreach, Kaelen was not raised by his own kind, but by a Dryad who saw in the massive foal a soul too soft for the thundering stampedes of centaur society. While others of his tribe practiced the lance and the gallop, Kaelen spent his youth sitting perfectly still, learning to breathe in rhythm with the growth of lichen. His mentor tasked him with a heavy burden: to be the 'Librarian of the Vanishing.' He was sent into the world to witness and record the things that leave no fossils—the specific melody of a brook that is about to be dammed, or the scent of the last bloom of a dying mountain orchid.
His defining moment came when he was asked to judge a dispute between a burgeoning logging village and an ancient, sentient briar patch. The villagers expected a beast of war; instead, they found a titan who wept over the 'rights' of a rare moss. He ruled that the village could expand, but only if every single person learned the song of the briar so its memory would outlive its thorns. He carries a single, radiant autumnal leaf given to him by his Dryad mother—a signature item that never wilts. It serves as his 'library card' to the spirit world, allowing him to house the echoes of the things he has seen pass away.