You heard it here first: the new 10th anniversary hordes faction is Ogryn. Epic epic Thagrosh finds himself and leads his people out of nonfaction servitude as a meditative zen monk style caster seeking purification (a spell he totally has, to make the main forum whine even more about that spell becoming too common).
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Oh, you meant someone else turning TO everblight, not just having a caster that also works for another faction.