Cewi, the enormous eyeless crocodile
IIRC bridges don't work on titans or FB?
After my previous story of dealing with 1 poisonous FB, I've had to deal with 2 more.
The first of these 2 was another vapor-releasing one. I tried the more or less same thing: I let it into my fortress, but had 3 good soldiers standing in it's path. They easily killed it but were once again covered in some hideous rotting substance. I decontaminated them, sealing off the removed substance in the chamber. Unfortunately, this time the poor soldiers began rotting even during decontamination. Advanced rot on nearly all external organs... 2 of the 3 decided to get out of bed before being fully treated, and went about their daily routine emitting miasma for a month before they eventually succumbed. The other (who was "really susceptible to disease") stayed bed-ridden much longer, eventually recovered, and is now the militia commander. Now I'm not so sure I think being disease-resistant is a positive trait
After this rather negative experience, I decided not to engage the next beast (poison blood!) with axes. Instead I dug out a 12-tile tall shaft, with a precarious walkway across. All held up by a single support, linked to a pressure plate. And a goat at the other end. That beast is lying in pieces at the bottom of the shaft now - forbidden pieces, behind a forbidden door. Now I need to get magma up another dozen levels so I can destroy these contaminants...
It's like DF: Chemical warfare edition