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It has been months since you saw the sunset city in a dream—towering minarets and domes, crossed by shadow and red light from the gently setting orb of fire that permanently rests outside the city. Since then, you’ve crossed these borders every night, searching for the city, hoping to set foot inside.
Desiderata
Atlach-Natcha AO spawns a lot of gates (and monsters) and seems to require investigators to discard (or have) spells.
Astronomer66
Perhaps the weakest AOs - not too well known in Mythos cannon. However, the chance to explore the Dreamlands adds a whole new layer to the base game and it's nice to include this side of Lovecraft's work, which is often overlooked or not as popular for some reason. I find this expansion very fresh and thematic.
Facebeard
Another good haul of extra cards, but the Dreamlands board is very situational and even against the Dreamlands Ancient One, Hypnos, we did not have a lot of cause to go there. If I was recommending an expansion, this is the one I'd put second last after Masks.