Results so far:
Grek has a very, very Dwarfy mist generator which it appears is supposed to turn into a magma disperser. The first time I pulled the lever it killed a few dwarves and then the magma stopped. I hadn't investigated the setup enough to be sure what caused that so I reloaded and investigated the setup more until I thought I understood what it was supposed to do. On the second attempt it immediately cast obsidian over the magma intake which plugged up the works. On the third try the screw pumps all deconstructed themselves before much damage was done. It might have been enough to cause a tantrum spiral though. I altered it to be a bit more direct and discovered that since it's pulling magma from the top of the pipe it quickly drains the pipe and can't pull in enough magma to overcome evaporation to truly flood the fort, if that's what is supposed to happen. It appears that some of the time there is enough death to start a tantrum spiral, but it doesn't seem to be what you were really going for. Bonus points for the fell mood right after I pulled the lever the first time though. One question: what does the pressure plate do? Okay, 2nd question: How did you get that one block of water to circulate around the mist generator? The mist generator is truly impressive.
Draco18s:
Not a valid save file. It looks like this is just post world generation. It has world.dat, no world.sav. Was it so effective it removed the fort from the face of the world?
Lordinquisitor:
When I try to load the game I get a FATAL ERROR: Missing Stone Gloss: SPELL_BLANK. This would appear to be the "Destroy the fabric of the universe" approach. I tried it under 40d16-Mayday and regular old 40d.
I'm personally more than willing to wait another week if others can finish.