This all sounds very, very interesting.
In particular I like the idea of arcane whatsits being found in stashes; it's much more interesting (at least to me) to have to not only enter the proper region type for an arcane item, but to also have to EXPLORE it a bit to get said item, as opposed to just going in the mission door which is often just a few steps away.
That is, IF it balances out correctly with the "missions giving spells" bit. Hoping there'll be good incentive to craft spells, versus just doing easy missions like Boss Delves or Stealth types, and grabbing all spells super-fast. The rarity orbs sound like they might do the trick for this though, but..... I wonder how it'll balance specifically with the way the game loves to UTTERLY DRENCH the worldmap in missions. Though that might be me overthinking things.
It sounds like, overall, this one is going to give ALOT more reason to explore in a general sense. Quite alot, actually.
I'd been wondering what you guys were up to regarding the next patch, and this really sounds absolutely spectacular.
Exploring buildings and caves, I've always found fun and challenging..... but they're way MORE fun if I have actual goals in mind for the specific places I'm going into (as opposed to usually just searching for granite and..... granite).
I wonder what Seek Resources scrolls will do now?