(Cross posted to Gameplay and Bug Report. Anyone have any ideas?)
Ok, so on my fort, we have a nice magma tunnel. It does not go all the way to the surface, but it goes close (roughly 3 floors down or so).
All is well. I'm building floors over the magma cap, putting workshops on those floors.
Until the Milhouse, Fire Imp of DOOM shows up.
He won't leave. He sits there, 1 tile down, in the magma (not on the surface).
He has not moved for over 2 years.
And my dwarves can see him from the room, which they immediately cancel their jobs over. Repeatedly. Over and over and over again. They literally take 2 steps away, decide to try again, then are interrupted. Over and over.
I finally had to forbid the entire room to get the 50 or so dwarves to leave the entranceway and go do something else.
So someone suggested putting military dwarves in front of him and let him come up to attack him.
Nope, he sits there, making faces at my apparently kobolds-in-dwarven clothing.
The marksmen can't shoot down to him, instead shooting towards him, but the arrows stay on the current Z level, flying out into oblivion.
I lost one engraver attempting to dig a fortification to attack him from the side. Thinking back, this wasn't my best idea ever.
The newest plan was to surround a 3x3 block of floor with channels above him, letting the resulting slab of doom slam into it's head.
This isn't working, of course, because the dwarves can see him through the cannels, and cancel the digging.
ANY idea as to a way to recover my mining operation? This is completely absurd!