Spider Form

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Version 0.19: This article may not be up to date for the latest stable release of Crawl.
Spider form.png Spider Form
Level 3
School1 Poison
School2 Transmutation
Source(s) Book of Changes
Casting noise 2
Spell noise 0
Power Cap 200
Hated By The Shining One
Flags Helpful, Utility
Transforms the caster into a venomous, spider-like creature. The caster becomes highly evasive and gains a poisonous bite, but gains vulnerability to poison and cannot evoke wands. It makes spellcasting slightly more difficult.

Spider Form is level 3 Transmutation spell that transforms the user into a spider-like creature.


This transformation grants the following:



  • Melds all equipment except jewellery
  • Cannot throw weapons or use wands
  • Natural AC is 2
  • -10% to spell success
  • Vulnerability to poison. Can be negated with a source of poison resistance, but sources do not stack.

The duration of the transformation is 8 + 2d<power> turns, capped at 60.

Mummies and ghouls cannot memorize this spell. Vampires can memorize this spell, but cannot cast it if they are satiated or less.

The Shining One doesn't mind if you cast this spell, but you will incur penance if you poison a sentient, non-evil monster. Using it against animals, undead, or demons works just fine (though the latter two are immune to poison).


This spell is quite useful for low-level Transmuters, as it is fairly easy to cast and can be made reliably castable with only 1 or 2 levels in Poison Magic (which can be used for other low-level spells like Sting or Cure Poison). Although the base damage is low, most monsters you encounter early in the dungeon are not poison resistant. Monsters will also have a harder time hitting you because of the evasion bonuses, but be aware that when they do manage to land a hit, you'll have very low AC to reduce it. Octopode and felid transmuters won't have to worry about the AC reduction, as their natural AC is already extremely low.

Be careful about using this spell around enemies with poisonous attacks, as it is impossible to have poison resistance while in Spider Form (and you'll be vulnerable to poison unless you've found a source of rPois). For poisonous enemies, consider upgrading to Ice Form later, if your skill progression makes it worthwhile. Other hazards to watch out for are high-accuracy effects that target AC, such as Fireball or Airstrike.

Spider Form
Spider transform.png


Prior to 0.19, Spider Form gave a large stealth bonus.

Prior to 0.15, Spider Form provided above-average speed and the ability to cling to walls.