I’m sure a chunk of you have run this through before, and I’m just as sure a decent number have had the heroes fail in their appointed task. So let’s say that the Godhood spell goes off. What happens now?
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One of my favourite campaigns had everything go off as Dregoth planned: he successfully takes control of the elemental vortices and becomes the overdeity of Athas. The heroes get thrown across the planes by the magical backlash of the spell and pierce the Gray, ending up in the Planescape setting. After some adventures, they learn a bit about the setting and eventually make it to Sigil – where almost anything can be learned if you have the means to pay for it.
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A schism occurs between members of the group – the characters, mind you, not the players. One side, the survivors, those most effectively shaped by the word of Dark Sun, feels that they’ve just managed to get out of the hellhole that is Athas and think they should count their blessings and go on with their lives, simply enjoying what the multiverse has to offer. The minority, on the other hand, who were somewhat more (unwisely) idealistic, or loyal to those they’d left behind on Dregoth’s turf, or simply refused to give up this fight, think it’s their responsibility to bring the bastard down.
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No-one wants the campaign to end, though, so I do the following: I give the players whose characters feel their time on Athas is done the chance to retire their avatars, at least for the time being, and create Planescape setting characters to join the group on their task. I decide to let them in somewhat behind on experience, but ahead in terms of treasure – adventurers shaped outside the resource restrictions of Athas, adhering to the wealth by level guidelines, but less inured to the harsh realities of a life that’s a complete struggle for survival every single day. Either way, everbody’s epic by this point. I promise that their old characters aren’t gone for good, and that they’ll be coming off the back burner eventually.
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So after some dedicated research, which involved more scheming, trading, maneuvering, hunting down valued objects, and cracking skulls than you can shake a fist at, the group manages to find what may just be a way to undo the effects of the godhood spell. Highly dangerous, of course, and procuring the necessary components is just the start of it: among other, simpler things, they need the combined essence of four major deities – one tied to each of the primary elements that made up the divine network of Athas. Whether the gods volunteer themselves for sacrifice, are coerced, or are forcibly made to give up their abilities is unimportant, but they need one of each.
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I’m sure I’m not the only one with a wild story that’s grown out of this masterpiece, and would be really interested in hearing how other folks’ adventures with the Lord of Giustenal went.

Sounds good, I’m running an adventure on K’ydon (cold planet in the athasian sphere detailed here: http://www.spelljammer.org/worlds/CrimsonSphere/ ) the players have learnt that Dregoth is up to SOMETHING as they were kidnapped by a group of Vrock led by a Nalfeshnee whilst investigating a ruined ancient temple with a strange crimson monolith at the centre. They slowly picked off their kidnappers one by one, and are about to return to K’ydon as 14th level characters (left at 8th level) and I will put them through DA – should be FUN!!! I intend for Dregoth to succeed.

Could always throw Dregoloth a curve and have it pull the Avangion along with him with the godspell. After all, no one actually has ever pulled it off before, and the spell might not have worked quite the way he intended. At that point it could break down to what side you fall on.