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40d:Fire imp
Fire imps are hellishly dangerous creatures that live in magma vents. They usually don't roam far from the vent, but sometimes they do and they will also surface and attack the odd dwarf who dares use their vent to fuel his magma smelter. They are rather small and easy to kill, unless they are able to breathe fire first that deals high damage and ignites objects and creatures. If you need to use imp-infested magma for your metalworks, consider setting traps or stationing marksdwarves around the furnaces. If you don't want to do that, you can follow the same procedure you use to prevent fire men from getting your dwarves. Another danger of fire imps (and fire men) is that they will attack wild creatures (not other imps or fire men), trading merchants and goblins. This can start a wild fire that will jump from ignitable tile to tile and can burn your entire map. It will not burn down trees but all vegetation gets covered in a layer of ash (non-usable). Creatures and dwarves alike are oblivious to the wall of fiery death and will stand there as it consumes them. For this reason, it is recommended that you keep an eye on the situation outside and give the orders for your dwarves to stay inside (o-i) when you see that flickering wall spreading from the magma vent area.
When a fire imp corpse is butchered, clouds of "boiling fire imp fat" will briefly bubble out from the Butcher's shop, which can ignite nearby items or clothes (at least one butcher has perished to this fate v0.28.181.40d.) Additionally, crafts made from their bones are quite valuable. Fire imp meat, though possibly a touch warm, is perfectly acceptable for use in cooking.
WARNING: Fire imp fat never stops burning. It's also immune to fire damage. Therefore you must crush fire imp fat to stop it from burning.
Catching Imps
Imps can be easily caught by building a channel or wall around the magma with only one little opening then placing cage traps in that one entrance; many traps in a row are recommended. The imps will run out of the magma with the intent of killing your dwarfs, only to get caught by your traps. This is a good semi-safe way to control the fire imps in your area. Just make sure your dwarfs are not going in areas that you have boxed off, or there will be nothing to stop them from killing your dwarfs.
Interesting Notes
When Fire Imps are injured, they bleed Goo.
Fire Imps cannot drown, and dumping them into water has no effect. The imp will escape the water and run away. "A touch warm" means that, when eaten, Fire Imp meat will cause a flurry of cancelled jobs as dwarves rush for beverages instead.