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 odinsgrandson wrote:
Ok, if the Empire is centered on a space station now, I'd like to dub it the Death Star

But from the picture, that's a Ringworld.

Actually, it reminds me of something quite different:

https://1d4chan.org/wiki/Planescape#Sigil

So just to clarify;
The realm of Azyr is Sigmar's realm, and when Sigmar retreated into self imposed exile all the realmgates were closed, and it has been cleansed.
(Part of the Stormcast fluff is that prior to the attacks on the realm of fire, the Stormcast were tasked with wiping out anything with even a whiff of Chaos to it in Azyr).
It's big, contains a number of cities and towns and villages, as well as other terrain - Castellants have to wander in the wilderness of a specific mountain range as part of their initiation.
Broadly the poluace of Azyr is human, but there are remnants of all the mortal 'good' races living there.

Azyrheim is the 'capital' city of the realm of Azyr, and is vast, and Dwarfs, Elves and humans - the proper retro ones, able to trace direct lineage to the world that was - live alongside mortals from the realms.
There are entire *armies* of each race living and training within Azyrheim's walls, alongside families, merchants, etc...

Sigmaron is the crescent thingy around the remnants of the world-that-was, is Sigmar's palace and workshop, it's where the Stormcast get reforged, are barracked and trained. There are also communities of other races in parts of it too. So Sigmar and the Stormcasts live on a space station with a few friends.

(One of my earlier posts had an incorrect theory on where the mortal races cane from)