The One Who Must Save Him

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Lozenge and her remaining companions encounter three mysterious unicorn mares in the ruins of Old Manehatten (outside Manehatten proper). One of them, tending the cooking fire, introduces herself as "The One Who Must Save Him", though none of the three state who "he" is.
She lives in the scavengers camp with Gingerbread Gear, Apple Bourbon, and her two companions, The One to Lead Him Astray and The One He Must Save. She speaks less than the former and more than the latter (who doesn't speak at all).
Like the other two mares, she wore a cowl at all times, obscuring details of her appearance. Lozenge notes she's "powerfully built for a mare, especially a unicorn".