He normally always listened to them. The voices in his head. They'd never done him wrong so far, and now, they were going to see him do right; at any cost.
A new religion is spreading throughout Equestria, rapidly but silently; a Cult that, legends say, can raise beings from the dead through the practice of dark, long-forbidden magic; and they WILL raise beings for a price so high, many deem it inconsiderable.
Grimack, a young hippogryph, has had voices in his head since he was a child; he listened to him; they told him stories, of other places and times, and, as he grew older, of dangers, and threats that he could neutralise without too much of a disastrous consequence.
Now he is told of a future that may come to be, if a Cult of mere legend does not succeed in it's plans, and it is up to him to aid them.
Faith will be tested, friends made, selves found, and all under the curtain of darkness. Equestria doesn't need to know. It can be left in the dark for this one.