Spider Form

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Version 0.15: This article may not be up to date for the latest stable release of Crawl.
Spider form.png Spider Form
Level 3
School1 Transmutation
School2 Poison
Casting noise 3
Spell noise 0
This spell temporarily transforms the caster into a venomous, spider-like creature. Spellcasting is slightly more difficult in this form.

In Spider Form you are granted:

  • A venom-branded unarmed attack with base damage 5
  • A +5 bonus to dexterity
  • Tiny size (improves EV)
  • A large bonus to stealth: the racial modifier is set to 21 (15 is normal for humans)
  • AC of 2
  • -10% to spell success
  • A to hit bonus
  • Vulnerability to poison. Any amount of poison is doubled. Can be negated with a source of poison resistance, but it's impossible to be resistant to poison.
  • Corpses cannot be butchered by hand

In spider form, you cannot wield a weapon, throw projectiles, or use wands, and you are only allowed to wear jewelry (other worn items will meld with your new form). The duration of the transformation is 10 + random2(power) + random2(power), capped at 60 turns.

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

As with all transformations, you lose all effects from melded armour and weapons, including any helpful resistances they may have granted you. Octopodes keep their 8 ring slots.

The Shining One doesn't seem to 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. 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.

Spider Form
Spider transform.png


Prior to 0.15, spider form provided a boost in speed and clinging.