I will never forget this day. The day that I beat the unbeatable.
Timad was a yellow jasper forgotten beast. He had no organs or blood, and his poison breath was deadly. The poison first killed your sensor and motor nerves so that a dwarf was numb and had a hard time maintaining a grip on equipment. The deadly portion, however, was the severe infection and rot it caused. The usual course of the poison involved both eyes rotting out, resulting in blindness. The rot would spread to the rest of the body. Eventually they would succumb to infection while spewing miasma everywhere.
My miners - before they died a horrible, rotting death - were able to cut both arms and feet off of Timad. But Timad was huge enough that simply slamming his body against them was enough to break bones while his poison did its work. 50 dwarves went to 40, then 20, then 10 and below able to actually fight. Towards the end I had 13 dwarves rotting on the hospital floor while Timad smashed beds and doors apart. He then moved towards the hospital, and I figured that was the end.
Then migrants came. They ran blindly to the meeting hall and smack dab into Timad. There they met their own infection-based death.
All died. Except for Imush.
Imush was a strand extractor. He had found his way past Timad but quickly was caught in a dead end. After Timas finished off the hospital he pathed towards Imush, and there they danced back and forth. Timad wouldn't charge in and attack him, while Imush wouldn't dare try to sneak past Timad again. Soon Imush began getting dehydrated. I figured he would die any day.
Then the inexplicable happened. A fucking
gremlin happened. He managed to sneak to the surface and and to my depot where a caged bear was sitting. He picked the lock and the bear ran free, immediately heading into my fort and towards Timad. This story would have been amazing if I could tell you that bear killed Timad - unfortunately, he did not. But he was able to attack Timad and latch onto his shell. The forgotten beast was distracted enough that Imush was able to sneak by and grab a drink in the food stocks. I immediately designated the outside as a burrow and shoved Imush into it. Once he reached the surface I had him build 4 walls onto each stairway into my fort, effectively sealing Timad inside.
Lacking any skills or tools, Imush was forced to brave the frozen ocean during a snow storm. I had some animal remains outside that he was able to butcher into some meat, but there wasn't any drink or any chance of getting a drink. Again he became dehydrated, and again I figured this was the end. Suddenly, the humans came, and with them sweet, sweet drink. Of course I had nothing to trade so I forced Imush to seize all the food and drink. Things began looking up after that, though the humans were pissed.
I then had an idea. I had all this stone laying around outside from various projects and my stone catapults. I made Imush a mason and had him work on my castle scaffolding, building stone floors over my fort entrance.
See, Timad was hanging around my central stairway beating up a donkey. I knew that if I could trigger a cave in on the surface it would travel all the way down and kill him.
Fall came, and with it more migrants. I turned them all into masons and made the floor larger and larger. I then designated the floor connected it all to be removed. A brave butcher took on the job...and boy did the job take a long time...but eventually it collapsed.
AND IT FUCKING WORKED.

(Imush is the dead "H" resting against the caved in walls on towards the right)
I nearly screamed out in joy when it happened. The dust cleared and there was Timad's corpse next to a large pit that used to be my central stairway.
Everyone that used to be in my fort is dead. There are corpses literally lining the hallways, hospitals, and bedrooms. But this migrant wave gave me a dozen or so dwarves of varying professions.
We shall seal off the underground and we shall rebuild.
RIP these guys
