Spellbook of clairvoyance

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spellbook of
+   clairvoyance   Light green spellbook.png
Appearance random
Abundance 1.52%
Base price 300 zm
Weight 50
Turns to read 6
Ink to write 15–29
Spell type divination
Level 3
Power cost 15 Pw
Direction non-directional
Special for samurai

In NetHack, the spellbook of clairvoyance allows you to learn the spell of clairvoyance. It is the special spell for samurai.

Effects

When cast, the spell magically maps a 19×11 area centered on your location.[1] As of NetHack 3.6.2, it also detects objects and presence of monsters in the mapped area. At Unskilled or Basic, monsters are marked with an I glyph, and objects are described in general ("a scroll", "a wand", etc.). At Skilled or above, monsters and objects will be shown as if you have seen them. If you have another source of clairvoyance, the spell will always be cast as Skilled.

The spell is blocked if you are wearing a cornuthaum and are not a Wizard. Unlike the clairvoyance provided by aligned priests and some items in NetHack, the clairvoyance spell only maps once per cast, and does not persist as a recurring effect.

Messages

You sense a pointy hat on top of your <head>.
The spell was blocked by a cornuthaum.[2]

Strategy

This spell is a more-than-passable alternative to magic mapping, especially for characters who can advance to Basic but not Skilled in Divination. Samurai get a reduction in failure rate on this spell, making it the only one that they can possibly cast consistently without a robe. It can be used successfully even on levels which are unmappable, especially since as of 3.6.2, monster and item locations will also be detected and revealed; this is especially useful in places like Gehennom when combined with intrinsic clairvoyance from aligned priests.

History

Before 3.6.2, this spell didn't show objects, and only detected monsters at Skilled or Expert. Before 3.6.1, it only mapped the affected area.

References

  1. do_vicinity_map in detect.c: Dimensions of mapped area
  2. spell.c in NetHack 3.4.3, line 943: Clairvoyance spell blocked by cornuthaum