Just lost my fortress world I've been playing since release because of an uprising within the fortress itself.
Once my fortress entered the advanced technological era, all of my crafters began work on a secret project. I couldn't see what it was, only that one of my miners dug out a huge area with a candy drill and had no supports. The opening spanned over fifteen z-levels.
Soon afterward, my researchers discovered that slade had strange properties. The crafter guild's leader immediately demanded to have it in extremely large qualities. My miners, having nothing to do, got a lot of it for them, and they accelerated work on their project. They didn't even leave to eat or drink and never slept. I had to establish a conveyer belt to bring the food to them.
Later, the opening got unrevealed, and the metalsmiths unexpectedly canceled their plasma rifle creation to build what appeared to be double doors with the letters "ARMOK" engraved on them. They also established an alarm. I wasn't sure why.
Things continued like this for a while. Technological advancements continued. When I looked at my plasma cell stockpile, it was all gone. Sure enough, I caught the craftsmen bringing it into the opening. I was angered, and didn't know what to think.
Suddenly I got an alert. "The alarm is going off!" and soon after "The silo doors are opening! Clear the area!" and my emergency bunker automatically triggered itself. My craftsmen stayed outside but at a far distance. Then I got a huge alert about trees being set on fire and looked at the silo.
What I saw baffled me. It was a huge rocket, but not like the normal warheads I have. This one had plasma canisters, modified to burn flesh. This is a biological weapon designed for the destruction of living things but not buildings.
When I checked the AI, I noticed it was set to break into three separate plasma canisters at high enough. Once the main payload hit the city, the plasma canisters would explode and rain acidic plasma on its target. I also saw its target: the humans.
Once it hit, I got two alerts: "The human nation of Bootmyths has declared war!" and, right after, "The human nation of Bootmyths has crumbled to its end." It took me a few seconds to realize that the warhead had wiped out all humans in the nation's capital, therefore destroying the nation.
Afterward, the elves and the rest of the dwarves declared war for crimes against nature, and my fortress was obliterated by an elf/dwarf army. Afterward I checked legends and fast-forwarded some years. The aftermath of the rocket caused clouds of plasma to spread across the atmosphere. Anyone that inhaled them had their bodies torn apart from the inside.
About ten years later, the world was devoid of life. Not a single living creature, sentient or otherwise, remained on the surface. Some cave creatures managed to survive but nothing could adapt. I deleted the region shortly afterward.
Now I warn you. If your craftsmen begin work on a secret project, don't let them.
You should have played as Deep Dwarves. Or maybe a settlement of goblins or dwarves that took shelter in the caverns.
Am I the only guy who doesn't mod his raws much? Seriously, even if yyou disabled tech caps, the elven unwillingness to cut wood throttles tech a bit before the Bronze Age for the most part. No metal tools, no coal, no steam or other power...