From DwarfFortressWiki
Magma forge
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| Weaponsmith, Armorsmith, Metalsmith, Crossbow-making
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| Construction
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| Materials
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A magma forge is a metalsmith's forge which does not require charcoal or other fuel, as long as it is positioned over magma. In order to function, the forge must be exactly one Z-level above a lava or magma square. Magma forges cannot draw from many Z-levels below themselves as wells can. It must be built of fire-safe materials
A magma forge will not function unless at least one of its eight edge squares hang over a channel which has magma at a depth of 4/7 or more. Dwarves will not roast when working inside a magma forge, unlike the unlucky soldiers you station right next to the vent.
