So the landscape for the dungeon is definitely Sharlayan architecture, although being near what's clearly arctic conditions makes for a bit of a funky one. Sharlayan's definitely a cold climate (it snows as part of the regular weather there after all), but is it 'polar bears' cold? Maybe in the north, around the Isle of Haam. It seems too well-maintained to be New Sharlayan, and even that's not actually very cold at all.

The actual Aetherfont, though, reminds me of a part of Eureka Pagos that we visit near the end of that story. The phenomena didn't really have a name there, just being called a 'massive concentration of aether', but it was described as mutating creatures around it. Impossible to say at this stage if that's an intentional callback or just a visual similarity, but given we got callback to Eureka just this past patch, I wouldn't be surprised!

Also, my gut says 'The Voidcast Dais' is probably a clever little pun on 'the die is cast'. And if true... oh, crap. That means something's about to happen that can't un-happen.