{{av}}
A '''Star Fissure''' is a rift in time and space in Mystcraft [[Ages]] which tears a hole from the surface of the world to a starry expanse at bedrock level. Any entity that touches the bottom of a Star Fissure will be linked to the Overworld spawn point.

Star Fissures are the only non-cheating option for trapped players to return to the Overworld, though they are relatively rare. Only ages that have the Star Fissure symbol will contain them.

== Location within an Age ==
In any age that has one, the Star Fissure will show up near the age's spawn point. Using a minimap, fissures appear as transparent holes on the map, making locating a fissure very easy. However, since players often cannot see the stars at the bottom of a fissure from the surface, Star Fissures can be difficult to identify and find in Skylands ages.

== Generating an Age with a Fissure ==
A player who has lost access to the Overworld can attempt to write or randomly find an age that has a Star Fissure. One can generate random ages by finding Sugar Cane, wood, and Feathers somewhere in their current age in order to make another [[Descriptive Book]] in an attempt to move to an age that does have a Star Fissure. When doing this, it is generally a good idea to stock up on supplies before moving as some ages do not have these materials readily available. Using an age with resources as a hub and keeping linking books to it can greatly aid the search.

v0.13:Instability

2018-06-20T20:50:48Z

Veovis Muad'dib: Alphabetize

{{av}}
[[File:White decay.png|thumb|Example of some white decay.]]

'''Instability''' refers to dangerous, destructive, or unpleasant features in an age. Instability can be caused by conflicts in an [[Writing|age's description]] or by an overabundance of rare resources—intentional or not.

In [http://dni.wikia.com/wiki/Myst_(Game) Myst lore], the [http://dni.wikia.com/wiki/Art Art] of writing ages was primarily focused on avoiding [http://dni.wikia.com/wiki/Art#Restrictions contradictions that would cause instability]. Mystcraft builds on that by also making it a balance mechanic.

== Levels of Instability ==
Instability comes in several degrees of severity. The weakest form a world that is vaguely inhospitable to outsiders. These are worlds that inflict potion-style debuffs on you, or that give mobs in the world a benefit/positive buff. The weakest form of these only affect you when you are "outdoors" (exposed to the sky); stronger forms affect you when you are inside/underground.

The middle severity form worlds that are generally dangerous. Worlds that are so close to the sun that you (and mobs in the world) take damage from the environment. Etc.

The final severity are worlds that will be destroyed given enough time. This can range from meteors, to decay blocks, to runaway erosion.

=== Severity Mechanics ===
Internally, instability can be generated (or reduced) based on factors of writing. Some symbols, such as "lacking medium features", directly add; others, typically that duplicate an instability affect, directly reduce. Explicitly writing inconsistencies will add, as will using "clear modifiers" to remove dangling modifiers.
Other factors include mod behavior (other mods can add or subtract instability) and general luck/variation as the world is explored (approximately every 100 chunks the instability level is recalculated based on what blocks the world contains).

Each type of instability can be individually disabled in the config file; if the nausea effect (for example) is a problem, one can disable only that and leave the others. On a server, the server must disable the unwanted effects.

Because instability levels can change over time, the current version of Mystcraft does not put block-based instability into the chunks at world gen, but alters the chunk during play.

Internally, there are 5 categories of instability levels. However, there is overlap at different levels of probability. World destruction is only found in the last 2 categories, for example, but different forms of world destruction are found at different probabilities in those 2 categories. Harmful environment can be found in the last 3 categories. Potion effects are found in at least the first 3 categories, can happen multiple times (will stack to a stronger potion effect level), and in later categories will affect you when you are not exposed to the sky (global/affecting the underground as well). These are managed internally using card deck mechanics.

== Status Effects ==

Instability can manifest as [https://minecraft.gamepedia.com/Status_effect status effects] on players and other [https://minecraft.gamepedia.com/Mob mobs] when inside an Age. Depending on how unstable the Age is, some effects may only show up on the surface of the Age, or they may be present regardless of location.

Status effects may appear at any level of instability, Ages with only surface status effects can still be quite livable.

=== Possible Statuses ===

* [https://minecraft.gamepedia.com/Status_effect#Blindness Blindness]
* [https://minecraft.gamepedia.com/Status_effect#Hunger Hunger]
* [https://minecraft.gamepedia.com/Status_effect#Mining_Fatigue Mining Fatigue]
* [https://minecraft.gamepedia.com/Status_effect#Nausea Nausea]
* [https://minecraft.gamepedia.com/Status_effect#Poison Poison]
* [https://minecraft.gamepedia.com/Status_effect#Regeneration Regeneration]†
* [https://minecraft.gamepedia.com/Status_effect#Resistance Resistance]†
* [https://minecraft.gamepedia.com/Status_effect#Slowness Slowness]
* [https://minecraft.gamepedia.com/Status_effect#Weakness Weakness]
* [https://minecraft.gamepedia.com/Status_effect#Wither Wither]

† Only applied to hostile mobs. {{Verify}} -- in earlier versions, all mobs (including cows, etc.) would be affected.

=== Notes ===

Surface effects will apply when standing on any block exposed to the sky. Transparent blocks such as [https://minecraft.gamepedia.com/Glass Glass] do not prevent exposure. {{verify}}

Some blocks from other mods may be transparent despite appearing solid; meaning they will not prevent exposure to surface level effects.

== Harmful environment ==
=== Random Explosions ===
Explosions are created randomly. These explosions can light blocks on fire, deal damage to the player and knock the player off the world if it is a Void, End, or Skylands world, but they are generally incapable of destroying blocks such as Stone.

=== Scorched Surface ===
Mobs and players can be set on fire. The fire damage is done in short bursts at approximately 5 second intervals that tick for 4-5 points of damage to mobs, but less than half a heart damage to unarmoured players. {{Verify}}

=== Charged ===
Lightning strikes will occur at random in the world.
All the normal effects of lightning will happen (creepers charge, trees catch on fire, etc.)

== World Destroying ==
Any of these will, unless countered by some sort of mod power, will ultimately result in the destruction of everything in the age, and potentially even leaving a void age in the case of meteors and black decay.

=== Meteors ===
Meteors will fall randomly from the sky and destroy large sections of the world. Meteors can destroy the entire world if given enough time. Meteors may leave some ores around the crater.

=== Decay Blocks ===
Several types of Colored Decay exist.

==== Black Decay ====

Time to break with diamond shovel: "fast" (Needs better testing.) {{verify}}<br />
Speed: Low.<br />
Unique feature: Causes ground to collapse.<br />
<br />
It only {{verify}} spreads to existing blocks, and it spreads faster up and down than it does to the sides{{verify}} (( this seems really wrong; in 1.4.7 my memory is that it would only spread down and sideways, not up, and would spread faster sideways. I have not seen black decay in modern Mystcraft )). It also has the unique trait when two blocks form on top of each other, they will merge into one block of decay and cause every block above it to fall, even blocks that are normally unaffected by gravity. It can be blown up with TNT.

Black decay will spread through bedrock. If it reaches the bottom of the world, then the entire column of blocks above it will fall out of the world.

Black decay collapsing will stop at air blocks; because of the presence of caves, or even a manually placed/carved airgap, black decay will leave scattered islands, at least temporarily. Because new decay blocks will be placed over time, eventually those platforms will go as well.

When a column collapses, the 4 neighboring columns can have air gaps collapse if the collapsing column goes up to the top of the air.

Any water on top of a collapsing column is deleted (replaced with air) {{verify}} the effect on other liquids such as lava.

==== Blue Decay ====

[[File:Colored Decay.png|thumb|Example of some colored decay.]]
Time to break with diamond pick: aprox. 2 seconds. {{Verify}}<br />
Speed: Medium.<br />
Unique feature: Spreads based on mining hardness.<br />
<br />
Blue decay travels through blocks at a speed based on the mining hardness; blocks that are easier to mine will spread faster. It will not spread through bedrock.

It can be blown up with TNT.

==== Red Decay ====

Time to break with diamond pick: aprox. 3 seconds. {{Verify}}<br />
Speed: Medium.<br />
Unique feature: Spreads based on TNT resistance.<br />
<br />
Blue decay travels through blocks at a speed based on the explosion resistance; blocks that are easier to blow up with TNT will spread faster. It will not spread through bedrock.

It can be blown up with TNT.

==== Purple Decay ====

Time to break with diamond pick: aprox. 10 seconds.{{Verify}}<br />
Speed: Medium.<br />
Unique feature: Spreads through liquids, other decay blocks, and air.<br />
<br />

It breaks around as fast as obsidian {{verify}}. If you are in the air, it's even worse than the feared White Decay.{{verify}}
It spreads rapidly through liquids, a little slower through other decay blocks, slower yet through air (but faster than red or blue spread through air), and very slow through ground blocks.

It has an 85% chance to spawn in a Dense Ores World{{verify}}. It can NOT be blown up with TNT. {{verify}}

Purple decay will not spread through bedrock.

==== White Decay ====

Time to break with diamond pick: aprox. 10 seconds.<br />
Speed: fast.<br />
Unique feature: Can damage player.<br />
<br />
[[File:White decay 20min.png|thumbnail|right|White decay after 20 minutes of instability, beginning to grow over meteor craters.]]
White Decay acts like the other colored decays, but eats through everything much quicker. It will eat through other decay blocks (tested in 1.4.7; even a black decay heavy world was calmed down. {{verify}} for current Mystcraft), and slowly grows into the air. It is also the only decay that can physically harm the player. It deals an armor-penetrating half-heart of damage per second, but only if the player is moving. It can NOT be blown up with TNT.

=== Crumble ===

An erosion effect; will cause blocks to break down. Diamond ore will turn into coal ore. Smooth stone will turn into cobblestone. Gravel will turn into sand. Logs into planks. Etc.

Given enough time, this will result in a world that is entirely sand.

In the most extreme form, bedrock will also erode, and the outcome will be a void world.

== Configuration ==

=== Disabling Effects ===

Instability configuration can be found in your [https://minecraft.gamepedia.com/.minecraft .minecraft] folder, inside <code>config/mystcraft/instabilities.cfg</code>.

Each instability effect can be disabled as desired by changing <code>true</code> to <code>false</code>.

Lines containing a [[#Status Effect|Status Effect]] followed by <code>,g</code> (such as <code>B:"hunger,g.enabled"=true</code>) refer to the global version of that effect. All other lines containing a status effect refer to the surface-level version of that effect.

=== Disabling All Instability ===

A shortcut to disable all instability is to set the <code>global.enabled</code> flag to false in the <code>instability</code> section of <code>config/mystcraft/balance.cfg</code>.

=== Profiling ===

When starting a new world with Mystcraft installed, a profiling process will begin in the background. This process is used to determine the rarity of the various blocks and liquids in the game. If an Age contains a significant amount of rare materials, instability will be added to compensate for balance.

If profiling degrades performance significantly and waiting for it to complete is not an option, it can be disabled in the configuration. See the comments in the <code>baselining</code> section of <code>config/mystcraft/core.cfg</code> for more details.

Advanced users can provide their own values for each block instead of profiling, by filling out <code>config/mystcraft/balance.cfg</code> and fully disabling profiling.

v0.13:Instability

2018-06-20T20:49:47Z

Veovis Muad'dib: Add wither effect

{{av}}
[[File:White decay.png|thumb|Example of some white decay.]]

'''Instability''' refers to dangerous, destructive, or unpleasant features in an age. Instability can be caused by conflicts in an [[Writing|age's description]] or by an overabundance of rare resources—intentional or not.

In [http://dni.wikia.com/wiki/Myst_(Game) Myst lore], the [http://dni.wikia.com/wiki/Art Art] of writing ages was primarily focused on avoiding [http://dni.wikia.com/wiki/Art#Restrictions contradictions that would cause instability]. Mystcraft builds on that by also making it a balance mechanic.

== Levels of Instability ==
Instability comes in several degrees of severity. The weakest form a world that is vaguely inhospitable to outsiders. These are worlds that inflict potion-style debuffs on you, or that give mobs in the world a benefit/positive buff. The weakest form of these only affect you when you are "outdoors" (exposed to the sky); stronger forms affect you when you are inside/underground.

The middle severity form worlds that are generally dangerous. Worlds that are so close to the sun that you (and mobs in the world) take damage from the environment. Etc.

The final severity are worlds that will be destroyed given enough time. This can range from meteors, to decay blocks, to runaway erosion.

=== Severity Mechanics ===
Internally, instability can be generated (or reduced) based on factors of writing. Some symbols, such as "lacking medium features", directly add; others, typically that duplicate an instability affect, directly reduce. Explicitly writing inconsistencies will add, as will using "clear modifiers" to remove dangling modifiers.
Other factors include mod behavior (other mods can add or subtract instability) and general luck/variation as the world is explored (approximately every 100 chunks the instability level is recalculated based on what blocks the world contains).

Each type of instability can be individually disabled in the config file; if the nausea effect (for example) is a problem, one can disable only that and leave the others. On a server, the server must disable the unwanted effects.

Because instability levels can change over time, the current version of Mystcraft does not put block-based instability into the chunks at world gen, but alters the chunk during play.

Internally, there are 5 categories of instability levels. However, there is overlap at different levels of probability. World destruction is only found in the last 2 categories, for example, but different forms of world destruction are found at different probabilities in those 2 categories. Harmful environment can be found in the last 3 categories. Potion effects are found in at least the first 3 categories, can happen multiple times (will stack to a stronger potion effect level), and in later categories will affect you when you are not exposed to the sky (global/affecting the underground as well). These are managed internally using card deck mechanics.

== Status Effects ==

Instability can manifest as [https://minecraft.gamepedia.com/Status_effect status effects] on players and other [https://minecraft.gamepedia.com/Mob mobs] when inside an Age. Depending on how unstable the Age is, some effects may only show up on the surface of the Age, or they may be present regardless of location.

Status effects may appear at any level of instability, Ages with only surface status effects can still be quite livable.

=== Possible Statuses ===

* [https://minecraft.gamepedia.com/Status_effect#Mining_Fatigue Mining Fatigue]
* [https://minecraft.gamepedia.com/Status_effect#Slowness Slowness]
* [https://minecraft.gamepedia.com/Status_effect#Poison Poison]
* [https://minecraft.gamepedia.com/Status_effect#Nausea Nausea]
* [https://minecraft.gamepedia.com/Status_effect#Hunger Hunger]
* [https://minecraft.gamepedia.com/Status_effect#Blindness Blindness]
* [https://minecraft.gamepedia.com/Status_effect#Weakness Weakness]
* [https://minecraft.gamepedia.com/Status_effect#Wither Wither]
* [https://minecraft.gamepedia.com/Status_effect#Regeneration Regeneration]†
* [https://minecraft.gamepedia.com/Status_effect#Resistance Resistance]†

† Only applied to hostile mobs. {{Verify}} -- in earlier versions, all mobs (including cows, etc.) would be affected.

=== Notes ===

Surface effects will apply when standing on any block exposed to the sky. Transparent blocks such as [https://minecraft.gamepedia.com/Glass Glass] do not prevent exposure. {{verify}}

Some blocks from other mods may be transparent despite appearing solid; meaning they will not prevent exposure to surface level effects.

== Harmful environment ==
=== Random Explosions ===
Explosions are created randomly. These explosions can light blocks on fire, deal damage to the player and knock the player off the world if it is a Void, End, or Skylands world, but they are generally incapable of destroying blocks such as Stone.

=== Scorched Surface ===
Mobs and players can be set on fire. The fire damage is done in short bursts at approximately 5 second intervals that tick for 4-5 points of damage to mobs, but less than half a heart damage to unarmoured players. {{Verify}}

=== Charged ===
Lightning strikes will occur at random in the world.
All the normal effects of lightning will happen (creepers charge, trees catch on fire, etc.)

== World Destroying ==
Any of these will, unless countered by some sort of mod power, will ultimately result in the destruction of everything in the age, and potentially even leaving a void age in the case of meteors and black decay.

=== Meteors ===
Meteors will fall randomly from the sky and destroy large sections of the world. Meteors can destroy the entire world if given enough time. Meteors may leave some ores around the crater.

=== Decay Blocks ===
Several types of Colored Decay exist.

==== Black Decay ====

Time to break with diamond shovel: "fast" (Needs better testing.) {{verify}}<br />
Speed: Low.<br />
Unique feature: Causes ground to collapse.<br />
<br />
It only {{verify}} spreads to existing blocks, and it spreads faster up and down than it does to the sides{{verify}} (( this seems really wrong; in 1.4.7 my memory is that it would only spread down and sideways, not up, and would spread faster sideways. I have not seen black decay in modern Mystcraft )). It also has the unique trait when two blocks form on top of each other, they will merge into one block of decay and cause every block above it to fall, even blocks that are normally unaffected by gravity. It can be blown up with TNT.

Black decay will spread through bedrock. If it reaches the bottom of the world, then the entire column of blocks above it will fall out of the world.

Black decay collapsing will stop at air blocks; because of the presence of caves, or even a manually placed/carved airgap, black decay will leave scattered islands, at least temporarily. Because new decay blocks will be placed over time, eventually those platforms will go as well.

When a column collapses, the 4 neighboring columns can have air gaps collapse if the collapsing column goes up to the top of the air.

Any water on top of a collapsing column is deleted (replaced with air) {{verify}} the effect on other liquids such as lava.

==== Blue Decay ====

[[File:Colored Decay.png|thumb|Example of some colored decay.]]
Time to break with diamond pick: aprox. 2 seconds. {{Verify}}<br />
Speed: Medium.<br />
Unique feature: Spreads based on mining hardness.<br />
<br />
Blue decay travels through blocks at a speed based on the mining hardness; blocks that are easier to mine will spread faster. It will not spread through bedrock.

It can be blown up with TNT.

==== Red Decay ====

Time to break with diamond pick: aprox. 3 seconds. {{Verify}}<br />
Speed: Medium.<br />
Unique feature: Spreads based on TNT resistance.<br />
<br />
Blue decay travels through blocks at a speed based on the explosion resistance; blocks that are easier to blow up with TNT will spread faster. It will not spread through bedrock.

It can be blown up with TNT.

==== Purple Decay ====

Time to break with diamond pick: aprox. 10 seconds.{{Verify}}<br />
Speed: Medium.<br />
Unique feature: Spreads through liquids, other decay blocks, and air.<br />
<br />

It breaks around as fast as obsidian {{verify}}. If you are in the air, it's even worse than the feared White Decay.{{verify}}
It spreads rapidly through liquids, a little slower through other decay blocks, slower yet through air (but faster than red or blue spread through air), and very slow through ground blocks.

It has an 85% chance to spawn in a Dense Ores World{{verify}}. It can NOT be blown up with TNT. {{verify}}

Purple decay will not spread through bedrock.

==== White Decay ====

Time to break with diamond pick: aprox. 10 seconds.<br />
Speed: fast.<br />
Unique feature: Can damage player.<br />
<br />
[[File:White decay 20min.png|thumbnail|right|White decay after 20 minutes of instability, beginning to grow over meteor craters.]]
White Decay acts like the other colored decays, but eats through everything much quicker. It will eat through other decay blocks (tested in 1.4.7; even a black decay heavy world was calmed down. {{verify}} for current Mystcraft), and slowly grows into the air. It is also the only decay that can physically harm the player. It deals an armor-penetrating half-heart of damage per second, but only if the player is moving. It can NOT be blown up with TNT.

=== Crumble ===

An erosion effect; will cause blocks to break down. Diamond ore will turn into coal ore. Smooth stone will turn into cobblestone. Gravel will turn into sand. Logs into planks. Etc.

Given enough time, this will result in a world that is entirely sand.

In the most extreme form, bedrock will also erode, and the outcome will be a void world.

== Configuration ==

=== Disabling Effects ===

Instability configuration can be found in your [https://minecraft.gamepedia.com/.minecraft .minecraft] folder, inside <code>config/mystcraft/instabilities.cfg</code>.

Each instability effect can be disabled as desired by changing <code>true</code> to <code>false</code>.

Lines containing a [[#Status Effect|Status Effect]] followed by <code>,g</code> (such as <code>B:"hunger,g.enabled"=true</code>) refer to the global version of that effect. All other lines containing a status effect refer to the surface-level version of that effect.

=== Disabling All Instability ===

A shortcut to disable all instability is to set the <code>global.enabled</code> flag to false in the <code>instability</code> section of <code>config/mystcraft/balance.cfg</code>.

=== Profiling ===

When starting a new world with Mystcraft installed, a profiling process will begin in the background. This process is used to determine the rarity of the various blocks and liquids in the game. If an Age contains a significant amount of rare materials, instability will be added to compensate for balance.

If profiling degrades performance significantly and waiting for it to complete is not an option, it can be disabled in the configuration. See the comments in the <code>baselining</code> section of <code>config/mystcraft/core.cfg</code> for more details.

Advanced users can provide their own values for each block instead of profiling, by filling out <code>config/mystcraft/balance.cfg</code> and fully disabling profiling.