Ozocubu's Armour

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Version 0.21: This article may not be up to date for the latest stable release of Crawl.
Ozocubu's armour.png Ozocubu's Armour
Level 3
School1 Charms
School2 Ice
Casting noise 3
Spell noise 0
Envelops the caster's body in a protective layer of ice. The caster will not suffer cold from this layer, yet can be affected by other sources of cold normally. The spell will not function for casters already wearing heavy armour (any body armour with an encumbrance rating of 5 or more).

Ozocubu's Armour is a level 3 Charms/Ice Magic spell which increases your AC by a significant amount, but increases your movement delay by 1 while active. The duration and size of this AC boost is dependent upon your spellpower, as shown below:

Normal AC Boost: 5 + 4 * (Spellpower/50) AC. (Max 13)
Duration: 20 + 2d(Spellpower) turns.

This AC boost stacks with the bonus given by Ice Form.

Ozocubu's Armour does have certain restrictions, however. The spell will fail if cast while wearing armour with an encumbrance rating of 5 or more, limiting the caster to robes, leather armour, troll leather armour, or steam dragon scales. Taking fire damage from beams reduces its duration significantly. The spell also conflicts with Statue Form and Ring of Flames, and cannot be used if any of these is currently in effect.


Ozocubu's Armour is a game-changing spell, providing a massive AC boost to any character who can manage the minimal skill investment required to cast it, and who doesn't intend to wear heavy armour. Even at its lowest spellpower, it's still equivalent to wearing an additional full strength ring of protection. Species with no body armour slot (felids, octopodes, and draconians) can (and likely should) keep an eye out for this spell by default. Other species that happen to find it can usually afford to drop down to a lighter class of gear; a fully enchanted robe of resistance or troll leather armour can prove extremely effective in conjunction with OA, and that's assuming you don't find a useful artefact option. Just be prepared to recast it on occasion when facing opponents which deal heavy fire damage; the damage it helps soak is usually worth the time spent refreshing mid-combat.

Ozocubu's Armour is not a particularly loud spell, but casting it is noisy enough to usually catch the attention of everything in line of sight. Any character who relies upon stealth and stabbing should avoid casting it while sneaking up on prey. Of course, if you're trying to catch the attention of a wandering monster without shouting and alerting everyone nearby, this spell is ideal.

However, Ozocubu's Armour is not a good spell to use if there is a chance you may need to run away from an enemy - especially 10-speed enemies standing next to you will be able to hit you if you try to run away under this spell, because of the speed penalty.


Prior to 0.18, Ozocubu's Armour did not come with a speed penalty.

Prior to 0.17, the effects of this spell were boosted in Ice Form and used the formula was 6 + 7 * (Spellpower/50) AC. (Max 20)

Prior to 0.15, the bonus AC calculation was link to your Ice Magic skill, not your spellpower:

  • Normal AC Boost - 4 + (Ice Magic/3)
  • Ice Form AC Boost - 5 + (Ice Magic * (7/12))

Prior to 0.14, the encumbrance rating limit for this spell was 6, allowing it to work with mottled dragon armour.