Clearly those dorfs were reality warpers or ethereal. I'm going with ghost engravers and magmabenders.
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In plant related news, a spore tree causing construction issues was felled and went straight into the cavern lake, much to my immense irritation. Cave trees largely look.... Off. Too large for the caverns, really. Only Goblin-caps and tunnel tubes really fit the mushroom theme of them in appearance. Also, new 'garden' plants spotted growing around the fortress surface turf: Eggplants, peanuts, flax, jute, chickpea, and sorghum. Eggplant and flax appear to be dominant, with peanuts and chickpea vying for second. There is also some kind of cottonleaf tuft plague around a lump of rock.
Founders are all set up for amenities, cabinet, box, bed. It's a little cramped in those rooms, but it's better than being stuck topside for the better part of a season waiting for proper rooms to be dug. A glass furnace has also been added down below, with Squib providing the bags via silk scattered around the residential districts. Nearly everyone's on masonry duty besides Dett who's smoothing walls in the eventual food storage room, and Trame who's felling trees and making furniture for the apartments. Masonry is largely being set up to plug that fuck-all hole in the new food storage room.
A barracks has also been built, with some floor blocks being repurposed into wall blocks and some storage being moved into the new 'room.' Overall, things are looking alright. With no clear reason for them to have uprooted, I'm wondering why the dwarves abandoned this place.