Someone knows how many avangion have existed on Athas?
I remeber only Korgunard and Oronis.
It’s true that Oronis teached Korgunard the preserver’s metamorphosys spell?
I’ve arranged in my campaing something but it’s totally stuff of my immagination.

According to the timeline of athas, (is that still available on Wizard’s website?) there were 3 avangions. Oronis taught both Korgunard and Nerad the spell. From what I have heard one of the novels (Tribe of One) introduces another avangion, but I am not sure never having read them.

The Tribe of One does introduce another one, but I tend to ignore that. It did not really fit the DS that I play in.

Definitely at least 3: Oronis, Nerad, and Korgunard. Nerad met an untimely end when he fought the Dragon, and Korgunard was killed by the Order.
Then of course there’s “The Sage” from Simon Hawke’s novels, who was originally an elf and by 2e rules shouldn’t have been able to become an avangion (his metamorphosis also involved growing feathers, suggesting he was becoming something more bird-like).
Also in one of the short stories (from an adventure modile) there’s Amiska, a fledgling avangion being hunted by Hamanu.
Rafernard, the false avangion from the Forestmaker module, is an illusion devised by Abalach-Re.
And lastly, there is the mystery of “the Great One”, the avangion whose face is on the Chak’sa and is known and instinctually revered by the thri-kreen.
Overall, that makes five or six real avangions mentioned in all the official stuff, at least two of whom would probably still be alive.

Amiska comes from Lynn Abbey’s short story “Service” (which came with the adventure Black Flames).

The Tribe of One avangion is largely ignored by most, correct.
Oronis developped the spell, helped Nerad become an avangion, and then Nerad died. Korgunard investigated the death of Nerad for years and through his search discovered Oronis, and convinced him to also teach him how to become an avangion. After Korgunard’s death, Oronis swore to no longer make anyone else an avangion.
Abbey imagined Amiska, but her background info is so sketchy anyone can make anything of her: new disciple of Oronis, researcher into the deaths of Nerad and Korgunard. You choose.
And a good part of the community goes with Xlorep’s idea that in the far future Oronis reaches his last level as an avangion, and as part of the 2E spell description is supposed to travel to other dimesnsions and stuff…but in this instance he returns to the distant past and becomes the Great One, raises a city to match the dreams of an avangion, and all crumbles when the armies of the Champions come ravaging in and Oronis – the spell completed – is to be found nowhere, returned to his own time period.

Hi guys, I’m new here but a long time DS fan. In regard to The Sage, he is indeed an elf but if you look in the 2nd edition rules for Avangions it says only humans can go the distance with the spell. That being said, The Sage will be killed by the spell eventually. I’ll keep checkin in around here and I’m excited to get to know all of you.
Take care,
Karos

Where does it say that non-humans would be killed by the spell? Unlike defilers/dragons, preservers/avangions generally are not killed by casting failure – they lose experience gained for the level and must recover it before trying again. (According to Dragon Kings.) I would just assume that non-humans wouldn’t be able to cast the first avangion metamorphosis spell at all, seeing as how they can’t normally reach level 20 as a preserver.
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That being said, there is an optional rule presented in the revised Dark Sun boxed set rules book: that high scores in their primary attributes would allow non-humans to exceed their maximum level limits. A score of 24 allows +5 to the maximum level limit… which would put an incredibly exceptional elf (with artificial boosts to his ability scores) normally limited to level 15 preserver up to level 20 preserver… which could hypothetically allow him to cast the metamorphosis spell. The Sage (elf avangion) is even described as having weirdly human proportions in The Nomad. Maybe he altered the spell to warp his body so that he could continue advancing as an avangion?
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This is all relying on optional rules and minute details, but hey, the Sage says he’s an avangion, and it just might be possible, if not plausible.

Personaly I feel lots about DS would need to be revamped, as most of regular D&D has been, through the crossings over 3rd and 4th editions. Lots of DS elements (not fluff, but mechanics/rules) were wonky to begin with.

Was there a reason other than game mechanics why an elf couldnt become an avangion? If not then in 4th there could be one? Problem solved?

Rajaat’s research, humans were the most affluent with “Life Use” magic of all the reborn species. There’s no mechanical limit in place with that back story – it’s just part of the, in my opinion, genre of Dark Sun.