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Editing v0.34:Obsidian

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{{layerlookup/0}}{{av}}{{Quality|Exceptional|21:08, 8 June 2010 (UTC)}}
 
{{layerlookup/0}}{{av}}{{Quality|Exceptional|21:08, 8 June 2010 (UTC)}}
  
'''Obsidian''' is one of the types of "[[stone]]" (technically volcanic glass) that forms entire [[Stone#Stones forming entire layers|layer]]s.  Obsidian is also found surrounding magma pools and volcanoes, exactly 1 tile thick, and has the distinction of being the only stone that can be [[obsidian farming|created during play]]. Obsidian is considered an [[Economic stones|economic stone]] by default; in order to allow general use at workshops and in architecture you must enable "obsidian" in the [[stocks]] "Stone" menu.
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'''Obsidian''' is one of the types of "[[stone]]" (technically volcanic glass) that forms entire [[Stone#Stones forming entire layers|layer]]s.  Obsidian is also found surrounding magma pools and volcanoes, exactly 1 tile thick, and has the distinction of being the only stone that can be [[obsidian farming|created during play]].
  
"Obsidian" is also the twelfth month of the dwarven [[calendar]], covering late Winter.
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"Obsidian" is the also name of the twelfth month of the dwarven [[calendar]], covering late Winter.
  
 
==Rock short sword==
 
==Rock short sword==
Obsidian can also be made into obsidian [[short sword]]s with one log at the craftsdwarf's workshop. If you embark on an obsidian [[mountain]] or manage to reach [[magma]] before finding metallic ores, these are good at first to defend your fort from early [[wolf]] and [[giant eagle]] attacks, but weak in comparison to any metal, having difficulty cutting even mundane animal hides. Note that with the use of wood (presumably used in the handle), [[Elf|Elves]] will be offended if you trade obsidian swords and refuse the trade.
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Obsidian can also be made into obsidian [[short sword]]s with one log at the craftsdwarf's workshop. If you embark on an obsidian [[mountain]] or manage to reach [[magma]] before finding metallic ores, these are good at first to defend your fort from early [[wolf]] and [[giant eagle]] attacks, but weak in comparison to any metal, having difficulty cutting even mundane animal hides. Note that with the use of wood (presumably used in the handle), [[Elf|Elves]] will be be offended if you trade obsidian swords and refuse the trade.
  
 
Obsidian is the only rock that can be used to make stone-based weapons.
 
Obsidian is the only rock that can be used to make stone-based weapons.
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Obsidian can be formed by mixing [[water]] and [[magma]]. Any tiles containing both [[water]] and [[magma]] will be replaced with unmined obsidian, generating abundant amounts of [[steam]]. When dumping water via a pond zone onto magma, the water has to fall free for at least one z-level (i.e. the pond zone must be two or more z-levels above the magma); otherwise only steam will be produced.
 
Obsidian can be formed by mixing [[water]] and [[magma]]. Any tiles containing both [[water]] and [[magma]] will be replaced with unmined obsidian, generating abundant amounts of [[steam]]. When dumping water via a pond zone onto magma, the water has to fall free for at least one z-level (i.e. the pond zone must be two or more z-levels above the magma); otherwise only steam will be produced.
  
Most non-[[magma-safe]] objects that were in the [[magma]] prior to the formation of obsidian are completely destroyed, which can be an effective method of removing unwanted items or enemies, although long exposure times to magma are suggested to ensure destruction. All [[magma-safe]] items will be entombed in the tile, and can be regained by mining it along with any magma-unsafe items that happened to survive the casting process.  No instances of globs of molten metal surviving obsidian formation have been noted, though apparently [[fire|burning]] objects can remain on fire when cast in obsidian. The survival rate of magma-unsafe items is believed to depend on the exposure time to magma being short enough to not cause the item in question to melt or burn before obsidian formation occurs—fragile items placed in [[water]] that is then exposed to magma tend to survive casting unscathed. Creatures cast in obsidian die, even without significant exposure to magma. Creatures in cages will survive the casting process, though they may still die from exposure to the extreme temperature of magma.
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Most non-[[magma-safe]] objects that were in the [[magma]] prior to the formation of obsidian are completely destroyed, which can be an effective method of removing unwanted items or enemies, although long exposure times to magma are suggested to ensure destruction. All [[magma-safe]] items will be entombed in the tile, and can be regained by mining it along with any magma-unsafe items that happened to survive the casting process.  No instances of globs of molten metal surviving obsidian formation have been noted, though apparently [[fire|burning]] objects can remain on fire when cast in obsidian. The survival rate of magma-unsafe items is believed to depend on the exposure time to magma being short enough to not cause the item in question to melt or burn before obsidian formation occurs--fragile items placed in [[water]] that is then exposed to magma tend to survive casting unscathed.
 
   
 
   
 
[[Obsidian farming]] can be used to produce large amounts of obsidian for masonry, crafting, or construction.
 
[[Obsidian farming]] can be used to produce large amounts of obsidian for masonry, crafting, or construction.
 
==Modding==
 
{{mod}}
 
Obsidian is frequently modified to be more glass-like in an attempt to make swords made of it viable. This is done by adding [SHEAR_YIELD], [SHEAR_FRACTURE], and [SHEAR_STRAIN_AT_YIELD] tags to obsidian's entry in inorganic_stone_layer.txt. Values used are typically those of glass: 33000, 33000, and 113, respectively.
 
 
==Real Life==
 
 
The use of obsidian to create short swords in Dwarf Fortress is almost certainly inspired by the ''macuahuitl'', a weapon used by the ancient and medieval indigenous peoples of Mesoamerica, of which the Aztecs are the most well-known. The weapon itself is more club- than sword-like in construction, being a long wooden handle with extremely sharp prismatic blades of obsidian embedded in its sides, usually intended to be wielded with one hand, though larger two-handed variations were known.
 
  
 
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