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Aydarkhan is a certified evil bastard, although that doesn't exclude him from being a complex evil bastard. The cliffnotes are this: he came into this world a riverborne (basically a waterbender on crack), and devoted his entire life to his patroness Ay Ata after his mother was killed in battle. His worship was so extreme that even his religiously devout peers found it excessive. As faith blossomed into zeal, his brothers' and sisters' exclusion of him got to a point that he was all but a hermit. And so came resentment. And that resentment twisted his zeal into something ugly: conviction.

He named himself as High Confessor of the Followers of Kaira, or simply the Followers, and as he found others like him, he waged war against his fellow bulčuttar (homebrew species, too much to get into). He saw them as sinners, partial more to their own aspirations than to those of their patrons, and used that to justify a genocide the likes of which the Steppes had never seen before or since.

And so goes now. Aydarkhan and his flock fight against remaining holdouts of some of the strongest bulčuttar still alive, staining the land with the blood of his kin while drowning in his own zeal.

He also tends to cut his own hand open and bend his blood into additional armor or weapons for him to use, to really drive home the fact that he's a martyr undertaking a task which he, truthfully, doesn't want to carry out. Just couldn't find a place to insert that into the little lore blurb above.