# Cloud

Dungeon features

&nbsp;&nbsp;Air

_&nbsp;Altar

#&nbsp;Corridor

#&nbsp;Cloud

#.&nbsp;Drawbridge

+-|&nbsp;Door

.&nbsp;Doorway

{&nbsp;Fountain

|&nbsp;Headstone

.&nbsp;&nbsp;Floor

&gt;&lt;&nbsp;Ladder

.&nbsp;Ice

#&nbsp;Iron&nbsp;bars

}&nbsp;Lava

}&nbsp;Moat

#&nbsp;Sink

&nbsp;&nbsp;Solid&nbsp;rock

&gt;&lt;&nbsp;Staircase

\&nbsp;Throne

^"&nbsp;Trap

#&nbsp;Tree

-&nbsp;|&nbsp;Wall

~&nbsp;Vibrating square

Not to be confused with poison cloud.
For other uses, see Cloud (disambiguation).
A cloud, #, is a dungeon feature that appears in NetHack.

Contents

1 Generation
2 Description

2.1 Plane of Air

3 History
4 Variants

4.1 Lethe patch
4.2 Biodiversity patch
4.3 SLASH'EM
4.4 UnNetHack
4.5 dNetHack

5 Encyclopedia entry
6 References

Generation
Clouds appear in the following areas:

The home and locate levels of the Wizard quest
Variations #1, #8 and #10 of the Big Room (dependent on chance), and
The Plane of Air, where far larger clouds appear.

The following information pertains to an upcoming version (3.7.0). If this version is now released, please verify that it is still accurate, then update the page to incorporate this information.

One of the themed rooms introduced in this version has a chance to generate a cloud at the center of the room. In addition, rays of fire that partially or completely evaporate pools or moats will generate temporary clouds of steam.
Description
Clouds allow unobstructed passage, but block line of sight - while inside a cloud square, you can see out of it, although adjacent cloud squares will block your vision as normal.

Plane of Air
Clouds on the Plane of Air are much larger in size: they move around and are occasionally subject to storms, which emit rays of lightning. If you are inside the clouds when lightning strikes, you are paralyzed for a few turns - this cannot be prevented with free action.[1]

History
Clouds first appear in NetHack 3.1.0, when the Quest branch, the Big Room and the Elemental Planes were introduced to the game.

Variants
Variants tend to make clouds somewhat more common in the dungeon.

Lethe patch
In the Lethe patch, the Lethe Gorge's seventh level has some small clouds near the temple in the northwest.

Biodiversity patch
The biodiversity patch's retool of the Priest quest has a home level for priests of the Knight's pantheon that features cloudy terrain.

SLASH'EM
The SLASH'EM Lawful Quest has a large cloud bank as its third section.

UnNetHack
In UnNetHack, some randomly generated rooms may have clouds within them. Clouds are also sometimes generated within the lower levels of Sheol.

dNetHack
In dNetHack, the goal level of the Madman quest is surrounded by cloud rather than a wall.

Encyclopedia entry

I wandered lonely as a cloud
That floats on high o'er vales and hills,
When all at once I saw a crowd,
A host, of golden daffodils;
Beside the lake, beneath the trees,
Fluttering and dancing in the breeze.

[ I Wandered Lonely as a Cloud, by William Wordsworth ] 

References

↑ src/timeout.c in NetHack 3.6.7, line 1613