Thanks for the encouragement and appreciation, guys.
does it have a lava spewing phallus, though?
Not explicitly, hah. There is plenty of lava spewing going on everywhere else, though...
The traps on the surface have been deconstructed, and their components transferred into the stockpiles beneath the dome. A few of the green glass axe blades had dozens of kills, with one getting nearly one hundred. The dwarves have retreated through the sealed passage, their paths covered by the rising tides of magma that flood what is now the only way in and out of the dome. The dwarves of Weatherwires, are now alone in their plight, sealed off from the world outside, forever.
The dome was meant to be a utopia - a spectacular city of hewn stone amidst an ocean of magma, where dwarves would not fear for death by goblins, or titans, or nameless evils beneath the earth. Now their utopia has become their grave, the final resting place of an entire civilization. From this point forth, if any visitors should happen upon Weatherwires, all they will find is an abandoned fortress built into the caldera of a volcano, littered with priceless gems and finished goods that were left behind by a race that disappeared overnight.
Now, the final stage of the fort can occur: the draining. The first point of drainage is the hole atop the central mesa. When drained to that level, the tops of all the buildings will become accessible. Since they have been previously flooded with water, they were muddied, and grew swaths of fungus. As discovered
earlier in the thread, when magma is applied to muddied stone that has been allowed to grow fungus (not constructions, as I have discovered), it burns away the fungus and leaves behind a tile of soil - in my case, either silt or red sand. Thus, the tops of these buildings, once the magma recedes below them, will first be covered with a layer of ash, which will deteriorate into sand or silt, and then begin to grow fresh fungus. This is extremely desirable from my point of view, as aesthetics are an important part of this fortress, and muddied tiles are perpetually brown - not the teal or yellow of cavern fungi.
Here are a few pics of the draining:
Pre-drainage:
Draining!
Stonesense cross-section of the drainage vortex: