I was going about my business and had been running this reclaimed fort with little to no trouble for about an in game year, getting everything sorted and figuring out where everything was, just struggling because apparently there are no trees at this fort. For awhile I thought a lack of water and a lack of trees is what made the whole place get abandoned. See, the carvings made early on on the fort walls to mark our return were about how 200 years ago it was ravaged by a forgotten beast, but I hadn't seen any in my adventures. Then, one day, the manager opened up one of the old bedrooms to claim an item he somehow knew was in there, and he activated an ambush. See, my experience with ambushes so far has been hostile creatures that are not a part of my group that have decided to live in the fort I'm claiming. Living there for a year made me wonder what the hell it was. And that was when we found it. The forgotten beast that had originally destroyed the fort. A massive one eyed humanoid tarantula with lacy wings and a poison bite. I stared in disbelief for a full minute, trying to figure out what I would do because we only had about 15 total dwarves at the time and only two were official military because there was too many things that needed to get fixed and arranged. I quickly added three more experienced warriors to the only military squad and assigned them to kill the beast. The manager tried to run and was doing really well... until he ran into a bedroom. As the beast slaughtered and began to eat the manager, I quickly locked the door, stationed my military outside the door after I was sure they had their equipment. I debated leaving it locked in there but assumed that it would eventually tear the door off the hinges if I didn't do something about it so I unlocked the door and took the beast out with limited problems. No more dead dwarves at least. Now our first manager is in a display case next to the beast and both of them have a memorial slab in front of their displays. If 8 goblins hadn't come by a month later while a child was struggling with trying to make an artifact using wood we don't have(possession fyi) and crippled half of my now 10 dwarf squad, I would take some time to do more engravings in hopes our victory can be documented.