Cloud

Dungeon features
Air	_ Altar
# Corridor	# Cloud
#. Drawbridge	+-| Door
. Doorway	{ Fountain
| Headstone	.  Floor
>< Ladder	. Ice
# Iron bars	} Lava
} Moat	# Sink
Solid rock	>< Staircase
\ Throne	^" Trap
# Tree	- | Wall
~ Vibrating square

Not to be confused with stinking cloud.

For other uses, see Cloud (disambiguation).

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# Clouds are a dungeon feature. They block line of sight, but you, monsters, projectiles and spells can pass through them unobstructed. While inside a cloud square, you can see out of it, although clouds in adjacent squares will block your vision as normal.

Clouds aren't generated as part of normal random levels. They appear on the Wizard Quest, in some variants of the Big Room, and most prominently in the Plane of Air. Clouds on the Plane move around, and occasionally shoot lightning. If you're inside the clouds when lightning strikes, you're paralyzed for a few turns; free action is no defense against this effect.

UnNetHack

In UnNetHack, clouds are sometimes generated within Sheol.

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 ]