So... I forgot that dragon fire can destroy drawbridges. Consequently, my fortress has dropped from 120 dwarves to 20 dwarves, half of whom are children. Also, the majority of the contents of the top half of the fortress were vaporized, and the entire forest burned down (again).
BUT! Among the survivors are 5 battle-hardened, Legendary level warriors. I had more, but a forgotten beast with deadly dust caused them to violently expel all of their blood out of every orifice shortly after they killed it. But I digress.
The point is, we're down but not out! I've finished construction on the lighthouse, but I'll be damned if I let this fortress fall before I've gotten it lit! I've dug down to the magma sea, but at this point I don't have the dwarfpower to pump magma 100+ Z-levels. And frankly, I doubt I'll be getting any more migrants in the foreseeable future after all the dwarves who've died.
The plan is simple: set cage traps around the magma pools and wait for fire imps or magma crabs to stumble into them. I've built a crystal glass pedestal at the center of the light chamber and set a worthless wooden artifact on it. Around the pedestal, I've stockpiled worn out clothing. Once I've caught a suitable fire-breathing creature, I'll set the cage at the top of the lighthouse and hook it up to a lever. I'll do the same with... idk, a cat or something. Maybe a disarmed goblin. Lock the doors, pull the lever, and watch the fireworks! Hopefully having all the flammable stuff around will increase the chances of the artifact catching fire.
Wish me luck! This plan is 100% reliant on it.