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[mirrizin]

So, I built a fortress next to a volcano, a peculiar one where the tube extended above the magma itself. I dug into the side two z levels above the magma and established a garbage dump. Seemed safe enough, until after one siege, I was left with a huge number of corpses. In the process of the dumping, it seemed like the more was dumped at once, the more it splashed, injuring several dwarves in the process. 

I'm guessing I have to dig out the next garbage dump a bit higher...

[ImagoDeo]

Yeah, this has been known for a while. Magma mist will spread further from its source the more of it there is, kind of like water. If you have 7/7 water in one block, it can spread out to 1/7 water in 7 blocks. Each item dropped in magma probably yields some capacity in the first block above the magma, and it spreads from there in every direction, expending itself by doing so. As long as the source has magma mist spread capacity though, it'll spread and melt dwarf faces.

[Lagslayer]

This has "EXPLOIT ME!!!" written all over it. Deadly magma fog on command, anyone? Sounds horribly inefficient, requiring tons of stuff to throw into the magma, but using little magma, which is basically an infinite resource. On the other hand, maybe if you can't get a lot of good mechanisms for another magma trap, this could allow you to affect a large area anyways. Infinite sand still works, right? Mass producing glass crap for dumping could fuel the process.

I imagine a sky fortress, with a huge tower leading up into it. Invaders come, to be greeted by glass raining from the sky as they climb the tower. But they are not the target. had they not been so preoccupied with what comes from above, perhaps they would see the threat which comes from below.

[ImagoDeo]

WEAPONIZE WEAPONIZE WEAPONIZE THE MAGMA MIIIIIIIST

Am I hearing you rightly?

[vanatteveldt]

So, I built a fortress next to a volcano, a peculiar one where the tube extended above the magma itself. I dug into the side two z levels above the magma and established a garbage dump. Seemed safe enough, until after one siege, I was left with a huge number of corpses. In the process of the dumping, it seemed like the more was dumped at once, the more it splashed, injuring several dwarves in the process. 

I'm guessing I have to dig out the next garbage dump a bit higher...

Apart from all the info on weaponizing this, the safe thing to do is make them dump through a diagonal:

Code: [Select]

.#.#.     . = hole above magma
#=#=#     = = dump zone
#   #     # = wall
 
(you can construct the walls above the magma or just find a good spot)

They can throw stuff through the diagonal, but mist, miasma etc doesn't go through

[Merendel]

Alternitively just make sure you do your dumping from a good distance up.  I tend to make my garbage shafts 6 or 7 Z lvls deep but then agian this also stems from the fact that I embark in reanimating bioms often and you want that much distance to keep the lively corpses from spooking your haulers each time they go to dump something.  Also means bolders get plenty of momentum to kill anything in the shaft in a single go should you have a need to kill the parts    Mist will still only go so far up, its just that 1-2 levels is withen easy reach.

On the subject of weaponizing though I picture a line if minecarts loaded with glass parts.  When the trap is triggered they are launched via roller  over a track stop that auto dumps the stuff down several Z lvls into the magma causing mist in the entrance coridor.   With 1 trap you can combine 4 of the 5 deadliest forces known to dwarves.   Magma, Minecarts, Serated glass disks, and glass terariums full of cats.  I would include clowns but it is far too difficult to try and load them into a minecart based trap to weaponize them.  Even if you manage it your ammunition count of clownshot will be too limited to make a significant difference. Still bonus points if there is actually no magma in the trap at first and the first several carts are loaded with magma to prime the trap... they'll never see that one coming.

[jcochran]

Well, someone in a different thread did weaponize magma mist. They made a magma mist generator using high speed minecarts skipping over ponds of magma. I'm sure a search will find the thread easily enough.