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[Supernerd]

If you can move it around safely then I recommend you can seal it up behind some floodgates and fortifications and have a poison vapor trap that can be turned on and off with a lever. Could be fun.

[Sutremaine]

Caveins should squash trees.

[Brilliand]

Digging out walls that border the caverns, might be tricky, though.  Hopefully you can find a column that doesn't contain any of those..

[Sutremaine]

Shouldn't be necessary to go near the cavern/rock border. What you're doing here is building a cavein trap in solid inter-cavern rock, and then turning the natural walls between the FB and the bottom of the trap into floors so the collapsed floor can fall through. There should not be a path between the trap and the cavern, until the collapse happens.

[Brilliand]

Shouldn't be necessary to go near the cavern/rock border. What you're doing here is building a cavein trap in solid inter-cavern rock, and then turning the natural walls between the FB and the bottom of the trap into floors so the collapsed floor can fall through. There should not be a path between the trap and the cavern, until the collapse happens.

Turning the natural walls into floors is the part I'm talking about - depending on the cavern layout, some of those natural walls directly below the trap might be cavern walls.  Odds are it's avoidable, but it's something to watch out for.

[Sutremaine]

There's already a floor for the cavein to go through, so that's the most dangerous part done. Depending on the curve of the cavern, there might be one tile that nicks the side of the cavern instead of going straight through the ceiling. But since it won't be at ground level, nothing will intentionally path to it. It would be wise to have a door where the dwarf stands to dig and a suspended construction behind it, just in case something flying is within LOS when the border wall is dug. The dwarf will run behind the door, which can be locked to buy enough time for the wall to be completed.

This would also work if you did need to dig a border wall at ground level, but more doors might be necessary if there are multiple FBs whacking at them. If there's more than one door for an FB to attack, they'll wear all the doors down instead of focusing on one.