Bad mutations

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Here is a list of all the bad mutations you can acquire. Although some may have valuable uses, they are at best mixed blessings. Even so, they are included here because "bad mutation" is a technical term in the game, not a qualitative judgment. Any of these can be acquired through any source of bad mutations.



Grants a chance of going berserk every time you attack. ("You feel a little pissed off.") Chance of berserking rises with rank (1%, 3%, 9%), while chance of passing out decreases. Clarity negates it.

1. You tend to lose your temper in combat.
2. You often lose your temper in combat.
3. You have an uncontrollable temper.


Deformed Body

Reduces AC provided by your body armour by half its base AC. Does not affect AC from any other source, and bonus AC from your Armour skill is still calculated based on the armour's full base AC. Ranks 2 and 3 have no further effect, other than making the mutation harder to remove. Nagas and Centaurs start at rank 1.

1.Armour fits poorly on your unusually shaped body.
2. Armour fits poorly on your deformed body.
3. Armour fits poorly on your badly deformed body.


Causes you to shout periodically, as though you'd pressed the "!" key. Higher ranks mean more shouting and also makes your shouts louder.

1. You occasionally shout uncontrollably.
2. You sometimes yell uncontrollably.
3. You frequently scream uncontrollably.



Slows your movement speed by multiplying your current speed score by 1.2 each rank. Does not affect your alternate forms. Nagas start at rank 2.

1. You cover ground slowly.
2. You cover ground very slowly.
3. You cover ground extremely slowly.


Grants teleportitis, similar to a ring of teleportation. Higher ranks increase frequency. An amulet of stasis negates it and other teleportation, while teleport control allows it to be controlled at the cost of glow.

1. Space occasionally distorts in your vicinity.
2. Space sometimes distorts in your vicinity.
3. Space frequently distorts in your vicinity.


Blurry Vision

Grants a cumulative 20% chance to fail reading a book or scroll per rank. Any rank disables passive scanning for traps.

1. Your vision is a little blurry.
2. Your vision is quite blurry.
3. Your vision is extremely blurry.


Lets you detect any monsters within a certain radius of you, even if invisible or through walls - usefully, this includes mimics. Prohibits use of helmets. Demonspawn may receive this upon leveling up. Rank 1: 3 tile radius (including the player). Rank 2: 5 tile radius. Rank 3: 7 tiles, plus gives see invisible.

1. You have a pair of small antennae on your head.
2. You have a pair of antennae on your head.
3. You have a pair of large antennae on your head.



Each rank increases the nutrition gained from vegetation while reducing that of meat, including chunks. Rank 3 prohibits eating any meat. Centaurs start at rank 1, and Spriggans start at rank 3.

1. You digest meat inefficiently.
2. You digest meat very inefficiently.
3. You are a herbivore.

Fast Metabolism

Each rank increases the nutrition cost of all actions by 1. Trolls start at rank 3, while centaurs start at rank 2.

1. You have a fast metabolism.
2. You have a very fast metabolism.
3. Your metabolism is lightning-fast.


Deteriorating Body

Causes periodic, temporary stat loss. Higher rank increases frequency. A ring of sustain abilities will negate this. Natural recovery from stat loss tends to keep rank 1 in check. Ranks 2 and 3 will eventually kill you via stat death if allowed to progress unchecked.

1. Your body is slowly deteriorating.
2. Your body is deteriorating.
3. Your body is rapidly deteriorating.


Each rank reduces max HP by 10%. This mutation is mutually exclusive with Robust.

1. You are frail.
2. You are very frail.
3. You are extremely frail.

Low Magic

Each rank reduces max MP by 10%. This mutation is mutually exclusive with Energetic.

1. Your magical capacity is low.
2. Your magical capacity is very low.
3. Your magical capacity is extremely low.

Reduced Attributes

Gives you -1 to an attribute per rank, up to -14 for each. Each of these mutations is mutually exclusive with its Improved Attribute counterpart.

You are weak.
You are dopey.
You are clumsy.

Slow Healing

Each level of this mutation decreases your regeneration rate by one third. This effect also affects the recovery rate of stat loss. At level 3, you will be unable the recover HP or attributes naturally.

You heal slowly.
You heal very slowly.
You do not heal naturally.

See Also