Bad Form

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Version 0.17: This article may not be up to date for the latest stable release of Crawl.

Bad forms is the name given to the transformations the player character can suffer when affected by a beam of polymorph, a weapon of chaos or a Transmutations miscast effect. Beams can always be resisted with magic resistance if the player didn't zap himself. Mutation resistance doesn't work, but undead players and those already affected by a bad form are immune. Followers of Zin can be protected by their god.

These are all the transmutations that can happen:

Transmutations usually are cancellable. Depending on the form, transmutations can interfere with, or outright prevent, spellcasting: eg, in Tree Form, you cannot cast Sublimation of Blood; in Pig Form, you cannot cast at all.


Most bad forms were added in 0.12. A jelly form was added (eats items, acidic attack but terrible defenses, no item use), but disabled before the branch for testing bad forms was even merged into trunk, let alone a stable release.

Porcupine Form was removed in 0.20.