Spellbook of knock

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spellbook of
+   knock   Light green spellbook.png
Appearance random
Abundance 3.56%
Base price 100 zm
Weight 50
Turns to read 1
Ink to write 5–9
Spell type matter
Level 1
Power cost 5 Pw
Direction beam
Equivalent wand of opening

Reading a spellbook of knock allows the player to cast the knock spell. This will unlock doors and containers, as well as revealing hidden doors. The effect is an exact duplicate of that of the wand of opening.[1]


Since a lock pick or skeleton key has a similar effect but doesn't cost power, this spell is almost useless, and is usually thrown away, polypiled, or overwritten. However, it has a few marginal uses:

  • It trains matter spell skill, which is useful in preparation for casting more powerful matter spells later (notably polymorph).
  • It opens the Castle drawbridge without needing an instrument to play the passtune.
  • It exposes secret doors whose locations are known to the player but not the character (on special levels, for example).
  • It unlocks doors at a distance and slightly faster than a key would manage. Because of this, it might be useful on the Astral Plane, though a wand of digging is better because it will raze the doors.
  • It causes engulfing monsters to expel you, making it useful on the Plane of Air.
  • It can free you from a bear trap or a web.[2]


In SLASH'EM, there are new indestructible doors at the top level of Vlad's Tower. This spell has no effect on them, there is no message, and nothing happens. Otherwise, the rest is exactly the same.

See also


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