A Rival / threat to the Mendevian Crusade would probably be a demon, a fiend-worshipping human(oid), a tiefling, a fallen ex-paladin, etc. Or, it could just be the result of someone messing with mother nature, with a dash of demon in the mix...
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Bleakfang is the result of a classic ‘a wizard did it’ situation. Apparently, neither worgs nor dire wolves were vicious enough for whatever crazed arcanist kept crossbreeding the two species, until he had a pack of intelligent and horse-sized 'dire worgs.' He, unsurprisingly, died at the fangs of his creations, and the coming of the Worldwound only made matters many times worse, as the few survivors of the ensuing carnage became tainted with abyssal corruption, and gained fiendish qualities. Bleakfang is the first pup to have survived the pack’s attempts to mate, after gaining their tainted condition, and he jealously slays any pup that displays the same qualities as himself (most notably, the wings), so that the remainder of his nine-member strong pack are ‘only’ fiendish dire worgs, and not, like himself, a magically potent half-fiend. (Even if the entire pack he travels with are eradicated in an encounter, and he has to flee using his black-feathered wings, there are always a few lower-ranking females squirreled away tending to pups, and he’ll be able to replace his losses within a few seasons.)
Unnaturally cunning, even for a fiend-tainted worg, Bleakfang has avoided the larger demons of the Worldwound, and struck out to the south to seize and dominate human prisoners, who are forced to raise livestock for the pleasure of their lupine overlords. Any attempting to flee the wolf-haunted hills discover that no skill they possess can evade the tracking skills of the pack, and they are dragged back to the community alive, to be devoured there as an object lesson as to what happens to those who attempt to flee the ‘mutually beneficent situation’ that Bleakfang has arranged. He plays at being the great protector of these fearful prisoners, having rescued them from the demonic threat to the north (although, in the event of a serious demonic incursion, he’ll abandon them to die without a second’s thought).
Boons Bleakfang will rarely interact (other than violently) with those outside of his pack, although those who help him or his pack survive a conflict with demons that have them outmatched, and who don’t seem weak enough to immediately betray, may earn some favor from him, although he will be quite cautious not to give away anything of value to himself, steering powerful potential foes towards demon enclaves or other places that might well be what they are specifically looking for, but are intended to eliminate one or more threats, depending on how the conflict pans out.
To someone who has seriously furthered his goals, bringing him new captives, for instance, or saving his own hide, he may gift them with a pup from his own pack, which will grow up to be a fiendish dire worg, not merely a powerful creature, but a ruthless, tyrannical and bloodthirsty creature, nothing at all like a wolf in personality, being motivated by selfishness and spite. As ‘gifts’ go, a fiendish dire worg pup is generally more trouble than it’s worth…
Stats for a fiendish 'dire worg' in the profile. As a half-fiendish dire worg, Bleakfang is notably tougher.