Huh. Dreaming Woods, liminal realms... I wonder if Castle Drachenfels is just a liminal realm of awful energy that just eventually spews out gribblies every once in a while, after it gets enough energy? That maybe this is just a thing that happens in Warhammer at times; places become renown for awfulness or purity or primordialness, some get usurped by Chaos daemons or sorcerers and some don't, and become a magical or eldritch location. And some of those places manage to become anathema to Chaos despite being a gribbly; becoming a place that is too tough a nut to crack to be worth expending the energy on usually, as the effort you'd expend to conquer it would also wind up depleting the place of its energy richness; so it's only worth destroying if it's actively acting against Chaos's interests (or if you can get a daemon or cultist to sneak their way in and overtake it somehow) and otherwise gets left at the bottom of the list of 'stuff we'll get around to eating when we've won the whole world.'
Or perhaps it's not so much that Castle Drachenfels is or has a reservoir of energy, as Castle Drachenfels is a pattern of energy. A story and magic told and woven by a sorcerer and the rest of the world long enough, consistently enough, that it became... well, Castle Drachenfels. It's a pattern in the aethyr that simply spits out gribbles. And possibly spits out an occasional Master like it's Castlevania showing up with Dracula again and again and again.
Also also, it looks like some earthy geographies simply interact with magic as a whole; some mountains might be born from titans, or maybe might birth titans; but otherwise mountains just shelter against magic. Woods meanwhile -- or at least those woods that were planted or given a spark of life by the Old Ones? -- gather and pool energies into a soul-of-the-woods. The seas might do something weird with magic too. (Not just the Galleon's Graveyard, but the seas and tides in general.) And then the ice or winter might too; and maybe might have had some spirits move in, or be born from it, too.
I'm curious as to what volcanoes might be like in terms of mystical-ness now. Was Hashut some kind of volcano genius locus or something, I wonder.
And Morghur, well, he seems like he might be a corrupt or Dhar-turned version of a Dreaming Wood avatar. A Beastmen deity, or daemon, might be a perfectly apt way to put him; maybe he's what Beastmen make of a liminal wood realm if they manage to get to its juicy energies. (Far from the first to make this speculation after the update, or even way before the update, but eh.)
The mountains. The forests. The winds, the fog, the tides, the magma flow, the glaciers... There might be many geological or geographical phenomena that are mystical and magical in this quest. That is, geological elements that simply natively accrue magic over time.
And that isn't even getting into what the presence of living beings might result in too. Not just in how living beings might influence or shape natural geological-magical phenomena, but also how living beings might create the equivalent of such phenomena too. Concepts such as crossroads or dreams or the Winged Lancers thing or underworlds or the bazaar where everything is for sale or The City or who knows. Not just gods they might create, but weirder things.
