Faintmetals, 25 Moonstone, 255
My civ is at war with the Elves for extra non-FB fun. Their first ambush happened before I had my elf burner built, and ended almost as soon as it was completed, so I still haven't burnt any of them to a crisp in a vat of boiling magma. I tried it out on some goblin ambushers, but a couple got across the bridge before a dwarf completed the second lever pull task so I had my militia beat them down. Including the marksdwarfs, who proceeded to attempt to beat the goblins to death with their crossows. It ended fatally for one of them, and the goblins camped on the side of a hill, which was also the side of my fortress. A couple seasons pass and they won't leave, so I decide to create a single chamber magma vent over them, but the pumps were barely completed when they finally left.
Before that, I had tried baiting them with civvies to get them to move. They were, for all intents and purposes, "stuck," it seemed. I wasn't going to let my dwarfs out to have fun, but I was annoyed at goblins for just standing around refusing to walk through my traps.
I haven't even bothered to pierce the caverns yet. With sediment, marble, a large lake and river, and a volcano, I'm basically self sufficient. I've got beds in storage far in excess of any possible future migration, and metal ores for days. They can siege indefinitely, and I don't think my dwarfs would ever have to leave the fortress ever again.
Yes, things are good in Faintmetals, nothing could possibly go wrong.