My cavern challenge fort has completed the move to a main area some 92 z levels deep wirh a portion of the cavern completly foored over about 17 z levels up, set up lots of wall less bedrooms in a grid every 5 tiles placed on the constructed floor.
Found out my masterwork obsidian short swords are useless against a crystal FB. 46 pages of combat reports, every single strike glances off. Scratching and biting were hurting it, but not killing it, it killed most of my troops, including the militia capt that had killed the mountian titan (Roc) and dragon. Finally the capt of the guard shows up with a steel battle axe and hits it in the lower body and the severed part sails off in an arc. Recovered two stuck in steel picks, and a dozen stuck in bolts. Can't even eat it. can't tan it's hide, no bones, got 3 worthless pieces of crystal.
I decide to get rid of another FB, this one is stuck on a shelf far above my section of built floor, and has deadly blood, I set up a <cave in , knock em into cage> room and have a miner dig out the wall letting the FB in. A series of unfortunate events ensues killing several more dwarves in combat and soaking my stairs to the surface with syndrome. I remove the stairs both above and below the contaminated area and build a detour around the area. I start seeing my dwarves leaving miamisma trails, and the hospital starts getting customers. muscle tissue layer items are rotting generating a diagnosis task, then cleaning task X6, surgury task X6 and a suturing task X6 per patient. At one point I had every bed filled(about 12 beds) and more dwarves trailing purple clouds that had not come in yet.
One of my projects was nearing go time so ordered my entire population into the cistern by setting a civilian alert, and watched as my dwarves filed in and then started treading water I had the lever pulled and 10 floor hatches opened, and some 20 dwarves took a short ride down the hatches into the soon to be farming chamber. deleted the burrow and let them get back to normal and give food and water to the patients. All the lovely waterfalls neatly counteracted the bad thoughts about the miasmia and served to wash off any syndrome materials where they get deposited on the walls.
My fort is unusual in that I enable all the labors on just about every dwarf, so the entire fort is going to the hospital and working the Diagnosing, cleaning, surgury, and sutureing jobs, and dwarves are getting well, and going back to work. Yes there is blood on the walls, but I have several more novice doctors now. :-)
Syndrome related losses: a few animals ZERO dwarves!