Like climbing Mt Olympus takes you to the Mt Olympus in the Astral plane.
Oh yeah, a bunch of evil gods resided in the Astral Sea! Pandemonium was there, Bane and Gruumsh's eternal battlefield was there... I think Tiamat too.
Bane and Gruumsh are fighting over Chernoggar. Tiamat and Zehir are fighting over the latter's native domain, Tytharion--and because of how her invasion worked,
both of them got the part they like least. She and her minions are stuck in the caverns below the surface, while he and his ilk are stuck on the mountainous surface, away from the caverns they prefer. Each is too weak to claim the whole domain, and too proud (and backstabby) to even attempt to cooperate in order to get the part they'd actually want to have.
And Pelor and Ioun shared a domain with the morally grey Erathis. The gods also had interesting relationships with conflicts.
Indeed. It's worth noting that
technically Ioun is also morally grey, she just has her primary rivalry with arguably the dirt-worst deity of the whole pantheon, Vecna. When your enemy is
friggin' Vecna, it's easy to come across as a good person purely from that opposition. She does seem to cleave very close to Good, but properly she's Unaligned; she comes across like Girl Genius's
Incorruptible Republic of the Immortal Library, which Ardsley Wooster describes as, "They lend out
any book to
anybody. Many people find this
irresponsible." (Emphasis in original.) In a world where magic is demonstrably real and potentially extremely dangerous, an "information wants to be free" attitude really does have some shades of morally dubious reasoning.
You also have the Unaligned Kord on Mount Celestia itself. (I always liked to think of it as Kord being Bahamut's boyfriend, which is why the two most uptight goody-two-shoes deities of the whole pantheon would tolerate a wild child like Kord living among them full time.) Though apparently in some other material he's presented as being more like The Goddamn Batman, as in, a
crazy prepared type that's willing to Do What It Takes to fight bad things and protect the things and people he cares about.
'The Plane Above' had a bunch of enemies PCs could have conflict with.
Indeed. And because it's my favorite plot point
of all time, I can't help bringing this one up.
Context: in 4e, the afterlife is
broken. Some souls just...don't get an afterlife. They get to
go to the Astral Sea, but they never get a connection to one of the divine domains. If they tried to live on said domain full-time it would friggin'
absorb them over time. Really bad juju. Unfortunately, there's basically nothing the gods can do, because the Dawn War, the destruction of the Lattice of Heaven, and the immense damage to their domains has basically fried the structure they built and it's almost miraculous that it works at all.
Double unfortunately, this means none of the gods really has any interest in trying to fix the problem, they just shrug their divine shoulders and focus on other things.
Except, of course, Bahamut. Because he is a badass, and he doesn't just talk the talk when it comes to being "one of the most compassionate beings in the multiverse." No, instead, since a direct
solution to the "broken afterlife" problem is not forthcoming, Bahamut has commissioned artisans from all the planes to create state-of-the-art DIVINE ASTEROID ARK-SHIPS to house all the souls of folks who didn't get an afterlife. They'll sail the Astral Sea in the vicinity of Celestia and other friendly domains, allowing these lost souls to at least have a safe, protected, comfortable place while the gods look for a more permanent solution. How friggin' awesome is that?!
Divine asteroid ark-ships are a canonical thing.
Except....turns out, Kord gets an itchy trigger finger in his concerns about the Dawn War coming back. So he, or at least some of his followers,
hijack the prototype ship shortly after its test voyage, intending to use it for some purpose or other related to fighting the remaining Primordials, which has a huge risk of actually
triggering the Dusk War instead. So now you're going out, to fight denizens of Celestia
specifically at Bahamut's request in order to prevent someone from accidentally-on-purpose triggering friggin' Ragnarok II: Deific Boogaloo.
The fact that this was a perfectly cromulent Epic-level campaign chunk in 4e remains one of the most
absolutely metal D&D things I've ever encountered and I love it to death. From top to bottom it's just excessively,
profligately cool.