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[Dorf and Dumb]

Because of FPS Death it is very hard for me to actually take on the "circus", but I was thinking about it.  For this assault the desired front-line weapon is the infamous Dorfen Boulder Gun that once worked in, I dunno, was it 28 or something like that?

You make a reservoir for magma and a reservoir for water, flowing out from either end onto a single square of empty space.  If they both flow out slowly (not too quickly) AFAIR they form boulders of obsidian mid-air that tumble in great numbers down the shaft to the circus gate below.  A bridge directly above the open space square stops the upward progress of ... clowns... and if I remember right sometimes they even get the Han Solo treatment.  Ideally, this is supposed to cause massive damage to everything below.  It is best to dorfen radar it to be over the ... ball pit in order that you don't get thousands and thousands of stones piled up.

In practice I don't think it was as effective as cave-ins though.  And nothing, nothing, nothing ever killed them fast enough to keep my interest up as the FPS sinks into the single digits.

Any of this still work?  There a knowledge base in this?

[Edmus]

I'd suggest a checkerboard, if you haven't already considered it.

[m-logik]

You won't get boulders this way, you'll get walls. But as long as they're unsupported they'll fall until they hit a floor, with the usual effects of a cave in. I failed to make something like this in my last 34.11 fort, and thought I was terribly clever to have come up with it. I'm a little disappointed (though not surprised) that it's been done before. I was going to call it the cave in cannon if it had worked...

I just ended up with a stack of obsidian walls and a lot of bored clowns, though.

[neblime]

You won't get boulders this way, you'll get walls. But as long as they're unsupported they'll fall until they hit a floor, with the usual effects of a cave in.

if you could get that to work (more than once) I think it would be the deadliest weapon ever

[Agent_Irons]

You won't get boulders this way, you'll get walls. But as long as they're unsupported they'll fall until they hit a floor, with the usual effects of a cave in.

if you could get that to work (more than once) I think it would be the deadliest weapon ever

With bridges to funnel the fluids around, that could work. It would be hell on your FPS, and the walls would collect at the bottom of the barrel, but it would kill large numbers of otherwise unkillable creatures.

[Girlinhat]

This is the "Dwarven Obsidian Chaingun" I believe was the name.  It may be linked to in my signature thread of Dwarven Relativity, I forget.  The idea is that you build floating floodgates, or bridges, between two reservoirs of water and magma.  When they meet, because there's no floor, the 1x1 obsidian block causes a cave-in and falls instantly, crushing anything beneath.  Because of the flow rate, this effect is VERY fast and deadly.  The problem is that the obsidian piles into a pillar quickly, unless you can position the machine above a glowing pit, it's going to clog very quickly.

You may instead consider dropping one large chunk of ceiling at once, to crush a large swathe of demons at once.

It's also worth noting that the FPS death demons cause is because they're flying and pathing all over your fort to kill things.  If you make an impassible (constructed masonry, not doors) airlock, sealing your soldiers inside with masons, then open the pit, the demons will only be able to path into the combat area you've set aside, so you can more easily dictate where the fighting occurs and deny them access further inwards.

[Panando]

It is my understanding that semi-molten rock will also absorb any caved-in material, i.e. magma piston wont work if dropped into SMR, it just swallows the whole thing. So an obsidian chain gun dropping down a shaft into SMR should do the trick - the only problem is, you'll only get one chance to smash non-fliers, as the first bomb will destroy any floor/grate/etc which they could have walked on. You'll still get oodles of deadly dust, and pulverize fliers out of existence. fortunately in this version thanks to climbing enemies may well try to climb up the shaft, making themselves vulnerable to being smished out of existence by falling obsidian.

[Dorf and Dumb]

Actually they weren't pathing up because I went in through the semi-molten rock instead of the adamantine (also I had a bridge in place over the hole), and even without the Gun in action the FPS dropped down to 13 or so.

Is there any way to cut down on the sheer number of clowns in the circus?  I see there's a "number of demon types" setting in worldgen but it's default of 20, not 100+...

[Aristion]

20 HFS means how many types of HFS there are not how many are populating the circus. So they are practically infinite.