The first major arc of the campaign I'm currently running revolved around seeking one of the more unique characters in Gloranthan lore: the Cleansed One, demigod of the Zola Fel River.
The story goes that the Cleansed One was a conventional broo of the Praxian wastes, who somehow became aware of the horror of their Chaotic condition. Rather than take out their self-loathing on the world like many other self-aware Chaos entities, this unnamed broo sought to drown himself in the waters of the Zola Fel to end their existence. Rather than drown him though, the river showed mercy: Zola Fel allowed the broo to breathe his waters, and walk on his riverbed. The broo followed Zola Fel's course to the ocean, and from there followed the river's current into the deeps, where by some mysterious agency of the Water powers he was purified of Chaos. He returned to the river a whole, unmutated broo, either as his kind were before they were cruelly changed by the Unholy Trio, or as something new. In my campaign I've also portayed him as an illuminate, but there's no textual evidence to back that directly that I'm aware of.
Are there any other known broo who've overcome their condition the way the Cleansed One has? There's a discussion active on the RuneQuest board as a right this that mentioned a broo having the capacity, if not the motivation or self-control usually, to worship Chalana Arroy. Are there any known broo in Glorantha who've done such a thing? Does anyone have thoughts on methods a broo might take to purify themselves as the Cleansed One has?