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[GhostDwemer]

If you can put magma between 2 doors, you can put magma on more than 1-z.  By having 2+ z worth of magma, you create pressure--thus having a magma cannon.  As soon as that first door is broken, the magma will shoot out burning and not giving the destroyer time to run.

Magma has no natural pressure, it can only be pressurized by a pump. You can not create pressure in magma by stacking it, like you can with water. Your idea will not work without a powered pump.

[Niddhoger]

Damn, nethercap mine carts don't work? I've always just used magma pistons or settled my fort over the magma sea/in third cavern layer (like for glaciers).  I never felt like fooling with impulse ramps and minecarts in general.  I also thought the concept of the self-replicating magma-piston was dorfy as all get out too.  After that I just need careful planning of tunnels+magma safe pumps to control it all.

Hmmm so you don't have access to iron on site, your civilization doesn't ever bring any to trade/can't request it, you don't have access to human merchants (they almost always have some), nor do you have a nearby tower/source of goblinite? I don't think that has ever happened to me, but then again I tend to always settle near at least a goblin or tower for "fun" Same for trading partners, even the elves.  Makes the game more interesting.

[PatrikLundell]

Well, I DO have trade access to steel and pig iron (humans and elves rarely survive in my pocket universes), but I intentionally embarked in a metal free area in a metal scarce universe, and I've decided to use only goblinite (and adamantine), with the exception that i buy crap metal (like gold) from caravans to satisfy strange moods and any special noble demands [the bronze bed for the mausoleum requirement in my previous fortress was unfair, in my view]. The goblins bring copper and silver, while the undead brought bronze (long time since they showed up last, though), and sadly, no kobolds. And I've actually gotten hold of a huge amount of adamantine (>1500 wafers), but then I've already reached retirement time (don't think there is anything of interest left to do: the goblins do not seem to advance in their sieges, just the same donation expedition once or twice a year. The caverns are gummed up by excessive tree growth and camping critters. The clowns have stopped rushing to their death [well, there is a bunch camping in my clown connection tunnels]. I think I may have used up all titans, and it was a long time since I saw any FBs [I did have 5 at the same time once, though]).

I've never explored magma pistons, but have minecart and impulse ramp experience (100+ level roundtrip tracks in two different fortresses, plus a rail gun that never saw use in a previous fortress), as well as magma and water pump stacks.