Editing v0.34:Evil weather

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Certain [[surroundings|evil surroundings]] feature freakish weather, such as fogs, clouds, and rains.  They may afflict those caught in them with various kinds of syndromes or curses, such as poisonings or transformation into [[Undead|zombies]].

== Types of evil weather ==
Two kinds of evil weather exist - evil rain and evil clouds.  The type of weather effect and their associated syndromes (if any) are different and randomly chosen for every evil biome in a generated world.  Usually there will be only one weather effect for a given evil biome, often in conjunction with the effect of [[Undead|corpse animation]].

Evil rain can be made of either the [[blood]] of a civilised race (dwarves, goblins, etc.) or a randomly generated inorganic substance.  Blood rain typically causes no syndromes, only giving whomever caught in it an unhappy [[thought]].  Generated substances are more dangerous, causing minor symptoms such as vomiting, blisters and fevers, as well as inspiring the aforementioned unhappy thought.

Evil clouds are made of a generated inorganic gas or dust.  They start in one tile and spread out in a similar manner to [[miasma]] vapour; when the game announces the cloud's presence, it will zoom into this tile.  Evil clouds cause more serious [[syndrome]]s than evil rains, similar to those of [[forgotten beast]]s, [[titan]]s and [[demon]]s.  Certain evil clouds transform living beings caught in them into dangerous [[Undead|zombie]]-like thralls, turning them against all life while significantly increasing their strength and toughness [[attribute]]s.

Name for evil weather is randomly generated, typically something along the lines of "abominable mist", "unholy gloom" (clouds) or "creeping murk", "horrid goo" (rain).

Evil weather forms on the edge of the map and moves about the screen. It does not necessarily respect walls, and may enter a fortress to affect your dwarves.

== Dangers of evil weather ==
Beware of both kinds of evil weather effects.  Though evil rains (excluding rains of blood) usually cause the "milder" types of [[syndrome]]s, these may still cause death as a secondary result of that syndrome: e.g. suffocation from blisters, dehydration from chronic nausea.  Evil clouds inflict worse [[syndrome]]s than evil rains; thralling clouds are especially dangerous in the extreme, as the zombies produced are much stronger than those produced via ambient effects. 

Some evil weather effects condense on creatures, making their effects semi-permanent - symptoms won't go away until the source is washed. Those effects also can spread like a disease. In most cases, it will just infect dwarves that carry contaminated bodies to caskets.  Thralling dust clouds, however, [[Fun|can quickly lead to an unstoppable zombie apocalypse]] if the dust is not completely washed off somehow.

Thralling clouds are also dangerous in adventure mode. Undead status means hostility from civilized beings, reduced speed and no regeneration. However, other undead will ignore you.