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Difference between revisions of "40d:Chasm"

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(Copyedit. Incorporate Standard "tributary chasm" showing lowermost level descending to the depths showing tributary chasm.)
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'''Chasms''' appear similarly to [[river]]s, but are not visible on the Local/Region/World maps. They are similar to the DFv0.23 chasms except that they are not guaranteed, seem to use the same river-generation code for the fortress map (a "chasm tributary" has been observed), and are bottomless.
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'''Chasms''' are a feature that appear infrequently in [[mountain]]ous [[biome]]s. They are a cave system identified by not having a floor on the lowest level (which is instead marked {{key|#}} ''Chasm''). They are similar to the DFv0.23 chasms except that they are not guaranteed to occur.
  
A chasm may be open to the top of the [[mountain]], or it can be hidden [[underground]] until discovered by a [[miner]].  Chasms are much more common on named mountains and [[volcano]]es, along with other special features such as [[cave river]]s.
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They seem to have two forms: '''tributary''' chasms, with a similar appearance to a brook or river (a bottomless "Grand Canyon"), and '''vent''' chasms, which are like a volcano vent without the magma (a bottomless chamber).
  
The presence of Extreme [[Cliff]]s (20+) on the Local Map may be, but is not necessarily, indicative of a chasm.
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Chasms may either be open to the sky or be enclosed [[underground]].
  
Often cave spiders are present near chasms, creating spider silk webs that can be collected.
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Chasms are not visible on the Local/Region/World maps. Chasms are much more common on named mountains and [[volcano]]es, along with other special features such as [[cave river]]s.
  
Chasms can also appear in a rounded shape, as below:
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The presence of Extreme [[Cliff]]s (20+) on the Local Map may be, but is not necessarily, indicative of a chasm.
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==Forms==
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===Tributary===
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A tributary chasm appears similar to the fringed tributary section of a brook sometimes seen in mountain areas.
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[[Image:Tributary chasm.JPG|Standard "tributary chasm" showing lowermost level descending to the depths]]
  
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===Vent===
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A vent chasm has a similar appearance to a volcano vent, except it does not contain magma.
 
[[Image:chasm.PNG]]
 
[[Image:chasm.PNG]]
 
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==Uses==
 
=== Platform-chasming ===
 
=== Platform-chasming ===
 
A technique of building a platform over the chasm, and then severing the platform from the [[wall]], can permanently dispose of garbage or excess [[stone]] set on top. The severed platform will disappear into the darkness below, and never be seen ever again.
 
A technique of building a platform over the chasm, and then severing the platform from the [[wall]], can permanently dispose of garbage or excess [[stone]] set on top. The severed platform will disappear into the darkness below, and never be seen ever again.
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It is possible to chasm [[refuse]] as it was in earlier versions. Designate a garbage dump [[activity zone]] over the chasm and adjacent walkable tile. Monsters may also spring from the chasm, and were provoked by the chasming of refuse in previous versions. It is unknown if these events still occur. Given that this technique still works, you can dump anything in your fortress by selecting {{key|k}} and marking items for {{key|d}}umping.  Also you can use [[standing orders]] to dump particular types of refuse.
 
It is possible to chasm [[refuse]] as it was in earlier versions. Designate a garbage dump [[activity zone]] over the chasm and adjacent walkable tile. Monsters may also spring from the chasm, and were provoked by the chasming of refuse in previous versions. It is unknown if these events still occur. Given that this technique still works, you can dump anything in your fortress by selecting {{key|k}} and marking items for {{key|d}}umping.  Also you can use [[standing orders]] to dump particular types of refuse.
 
Dwarves may cancel the dump task due to [[creatures]] in the chasm below, even if those creatures can't reach them {{version|0.27.176.38c}}
 
Dwarves may cancel the dump task due to [[creatures]] in the chasm below, even if those creatures can't reach them {{version|0.27.176.38c}}
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===Resources===
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Often cave spiders are present near chasms, creating spider silk webs that can be collected. As the chasm exposes every layer to view they provide access to easily identified resources such as [[ore]] deposits.
  
 
== Hazards ==
 
== Hazards ==

Revision as of 05:02, 9 June 2008

Chasms are a feature that appear infrequently in mountainous biomes. They are a cave system identified by not having a floor on the lowest level (which is instead marked # Chasm). They are similar to the DFv0.23 chasms except that they are not guaranteed to occur.

They seem to have two forms: tributary chasms, with a similar appearance to a brook or river (a bottomless "Grand Canyon"), and vent chasms, which are like a volcano vent without the magma (a bottomless chamber).

Chasms may either be open to the sky or be enclosed underground.

Chasms are not visible on the Local/Region/World maps. Chasms are much more common on named mountains and volcanoes, along with other special features such as cave rivers.

The presence of Extreme Cliffs (20+) on the Local Map may be, but is not necessarily, indicative of a chasm.

Forms

Tributary

A tributary chasm appears similar to the fringed tributary section of a brook sometimes seen in mountain areas. Standard "tributary chasm" showing lowermost level descending to the depths

Vent

A vent chasm has a similar appearance to a volcano vent, except it does not contain magma. Chasm.PNG

Uses

Platform-chasming

A technique of building a platform over the chasm, and then severing the platform from the wall, can permanently dispose of garbage or excess stone set on top. The severed platform will disappear into the darkness below, and never be seen ever again.

Garbage dump

It is possible to chasm refuse as it was in earlier versions. Designate a garbage dump activity zone over the chasm and adjacent walkable tile. Monsters may also spring from the chasm, and were provoked by the chasming of refuse in previous versions. It is unknown if these events still occur. Given that this technique still works, you can dump anything in your fortress by selecting k and marking items for dumping. Also you can use standing orders to dump particular types of refuse. Dwarves may cancel the dump task due to creatures in the chasm below, even if those creatures can't reach them v0.27.176.38c

Resources

Often cave spiders are present near chasms, creating spider silk webs that can be collected. As the chasm exposes every layer to view they provide access to easily identified resources such as ore deposits.

Hazards

Dwarves fighting near the edges of cliffs have a propensity to dodge right off the precipice, falling to their deaths.

The chasm is also home to many types of hostile creatures, including iron men, troglodytes, giant cave swallows, antmen, giant cave spiders, ratmen, batmen, Trolls and Gremlins

Worlds