Confused by unlock sequence

[Dreamdancer]

I am somewhat confused by the unlock sequence:
Beat quest at Northern Desert -> unlocks Shifting Passage (with a quest to unlock a new dungeon - this I expected) AND Cursed Oasis (without any quest - Missing the Taxidermist quest, but this one probably only comes when I have all Taxidermist classes)).
So I am confused. Would have assumed that Shifting Passage would unlock the Oasis, which will unlock the Library (after GT). Or I am forgetting another dungeon in the north?
It's to long ago that I unlocked it all in the beta...

[Lujo]

Shifting passages unlocks the library after the quest. Cursed oasis unlocks at the same time as shifting passages. It's the same in every direction except the south which takes a special subdungeon to unlock stuff beyond hex.

[Dreamdancer]

Ok, thanks for the info. Thought the vicious dungeons would only unlock after beating the main quest line.

[Darvin]

Traditionally it was:
Northern Desert -> Rock Garden -> Shifting Passages -> Demonic Library
Rock Garden -> Cursed Oasis

The Oasis has always been an outlier. Every directional path has such an outlier: Magma Mines in the west, Slime Pit in the south, and Berserker Camp in the east.