Bad mutations

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Version 0.14: This article may not be up to date for the latest stable release of Crawl.

Here is a list of all the bad mutations you can acquire. Although some may have situational uses, they are at best mixed blessings. Any of these can be acquired through any source of bad mutations.

Contents

Offensive

Berserk

Rank Effect Flavor
1 1% chance of berserking each time you attack. Reduces chance of passing out afterwards to 3%. You tend to lose your temper in combat.
2 Same, with a 3% chance of berserking and 2% chance of passing out. You often lose your temper in combat.
3 Same, with a 9% chance of berserking and 1.5% chance of passing out. You have an uncontrollable temper.

Often referred to as "berserkitis", Clarity or "Near Starving" hunger negates this.

Bad mutation

MP-Powered Wands

Rank Effect Flavor
1 Zapping a wand costs 3 MP but increases spellpower by ???. You expend magic power (3 MP) to slightly strengthen your wands.
2 Zapping a wand costs 6 MP but increases spellpower by ???. You expend magic power (6 MP) to strengthen your wands.
3 Zapping a wand costs 9 MP but increases spellpower by ???. You expend magic power (9 MP) to make your wands much stronger.

Bad mutation

Defensive

Deformed

Rank Effect Flavor
1 Reduces body armor base AC by half. Species can wear armour: Armour fits poorly on your unusually shaped body.
Species can't wear armour: Your body is misshapen.

Does not stack with Jiyva's Pseudopods mutation. Does not affect AC from any other source (i.e. other equipment, the protection ego, etc.). Bonus AC from your Armour skill is still calculated based on the armour's full base AC.

Species notes: Nagas and Centaurs start with this mutation.

Bad mutation


Scream

Rank Effect Flavor
1 Periodic shouts, as though you'd pressed "t, t". You occasionally shout uncontrollably.
2 Louder and more frequent shouts. You sometimes yell uncontrollably.
3 Loudest and most frequent shouts. You frequently scream uncontrollably.

Bad mutation


Movement

Slow

Rank Effect Flavor
1 Movement delay * 1.2 You cover ground slowly.
2 Movement delay * 1.44 You cover ground very slowly.
3 Movement delay * 1.728 You cover ground extremely slowly.

Does not affect your alternate forms.
Only occurs as a starting mutation, i.e. does not occur randomly.

Species notes: Nagas start at rank 2.

Bad mutation


Teleport

Rank Effect Flavor
1 Teleportitis, limited to short distances. Space occasionally distorts in your vicinity.
2 Frequent Teleportitis, limited to medium distances. Space sometimes distorts in your vicinity.
3 Very frequent Teleportitis to anywhere on the level. Space frequently distorts in your vicinity.

An amulet of stasis negates it like any other form of teleportation.

Bad mutation


Perception

Blurry Vision

Rank Effect Flavor
1 +15 auts to read books or scrolls. Worse detection of nonadjacent traps. It takes you a little longer to read scrolls.
2 +20 auts to read. Worse detection of nonadjacent traps. It takes you longer to read scrolls.
3 +30 auts to read. Worse detection of nonadjacent traps. It takes you much longer to read scrolls

This aut penalty occurs before the effect of the scroll. If you are using a targeted scroll (e.g. a scroll of blink) and cancel it using ESC, you will forfeit the time spent and the effect will not take place. Note that the normal 10 aut length for reading and using a scroll does not apply; if you have Rank 3 of this mutation, then it will only take 30 auts in total to read and use a scroll.

Prior to 0.16, this mutation gave a 20%/40%/60% chance to fail all attempts to read books or scrolls.

Bad mutation


Diet

Herbivorous

Rank Effect Flavor
1 Meat nutrition-, vegetation nutrition+. You digest meat inefficiently.
2 Meat nutrition--, vegetation nutrition++. You digest meat very inefficiently.
3 Meat inedible, vegetation nutrition+++. You are a herbivore.

Species notes: Spriggans start at rank 3.

Bad mutation


Fast Metabolism

Rank Effect Flavor
1 Nutrition cost of all actions +1 You have a fast metabolism.
2 Nutrition cost of all actions +2 You have a very fast metabolism.
3 Nutrition cost of all actions +3 Your metabolism is lightning-fast.

Species notes: Trolls start at rank 3 (and also have a further, species-specific hunger cost).

Bad mutation


General

Deterioration

Rank Effect Flavor
1 Periodic temporary stat loss. Your body is slowly deteriorating.
2 More frequent temporary stat loss. Your body is deteriorating.
3 Most frequent temporary stat loss. Your body is rapidly deteriorating.

A ring of sustain abilities will negate this. Natural recovery from stat loss tends to keep rank 1 in check, though not always. Left unchecked, ranks 2 and 3 will leave you extremely handicapped, and will eventually result in stat zero.

Bad mutation


Forlorn

Rank Effect Flavor
1 Reduces piety gains by 33%. You have difficulty communing with the divine.

This mutation was added in 0.15, and will be removed in 0.17.

Bad mutation


Frail

Rank Effect Flavor
1 Max HP -10% You are frail.
2 Max HP -20% You are very frail.
3 Max HP -30% You are extremely frail.

Bad mutation


Low MP

Rank Effect Flavor
1 Max MP -10% Your magical capacity is low.
2 Max MP -20% Your magical capacity is very low.
3 Max MP -30% Your magical capacity is extremely low.

Bad mutation


Reduced Attributes

Rank Effect Flavor
1 -2 to STR, INT or DEX You are weak
You are dopey.
You are clumsy.
2 -4 to STR, INT or DEX You are very weak
You are very dopey.
You are very clumsy.

While it's possible to gain this mutation multiple times, each attribute is limited to 2 ranks.

Bad mutation


Slow Healing

Rank Effect Flavor
1 Regeneration rate decreased by 50% when enemies in LoS You heal slowly when monsters are visible.
2 Regeneration rate decreased by 100% when enemies in LoS You do not heal naturally when monsters are visible.
3 Regeneration rate = 0 You do not heal naturally.

This mutation also affects the recovery rate of stat loss. At rank 3, you will be unable to recover HP or attributes naturally.

Species notes: Ghouls start at rank 1, Deep Dwarves start at rank 3.

Bad mutation


Subdued Magic

Rank Effect Flavor
1 Spell Power-, Spell Success+ Your spells are a little easier to cast, but a little less powerful.
2 Spell Power--, Spell Success++ Your spells are easier to cast, but less powerful.
3 Spell Power---, Spell Success+++ Your spells are much easier to cast, but much less powerful.

Bad mutation


See Also

History

Prior to 0.14 the Slow mutation occurred randomly and levels 1 and 2 of the Slow Healing mutation cut natural regeneration by 33% and 66% respectively, regardless of enemy presence.

Prior to 0.13, Reduced Attributes could be acquired up to 14 times, giving you -1 per rank.