In the wonderful world of HellMOO there are strange powers gained through the wonderful effects of radiation. These powers are called mutations and there are many mutations available in the game. Their locations are documented in Injection Junction in Freedom City (marked IJ on your map). The mutations can be acquired in specific locations that are hidden or a little difficult to reach. When you find a mutation, something similar to this will appear:

 You realize you could mutate here.
 Type 'mutate snakeskin' to develop the 'snakeskin' mutation.

Will you mutate?

If no, then just continue with what you are doing. If you don't type the exact command mutate snakeskin, you will not gain this mutation. If yes, then something will happen, very similar to this next example.

 [ Your slashing resistance increased by 2 - 4! ]
 [ Your stabbing resistance increased by 1 - 3! ]
 Creature's body twists and shudders...
 [ You've developed the 'snakeskin' mutation! ]

Before you mutate, think it over. Removing mutations is costly. So, make each choice wisely. Some mutations are considered superior to others due to their gameplay benefits, those will not be singled out here. Your mutations are a part of what makes your character unique. It is up to you to decide which mutations make the most sense for your character. Mutations can be pretty useful but they also have their downsides.

Generally, if not always, mutation areas are slightly irradiated. Radiation comes with its own dangers, such as special temporary radiation mutations or cancer (which is not a mutation). However, gaining radiation mutations from mutation areas is difficult - your rad count will generally drop faster than it will increase. As such, highly irradiated areas (like the Wasteland) are your best shot for gaining a radiation mutation.

Note: The soak/focus/other distinction does not exist in-game, and is merely for convenience.

Soak mutationsEdit

Soak mutations (or "Skin mutations") are now limited to three per player. Level 2 mutations are all upgrades to level 1 mutations and require their level 1 counterpart. You can have 3 soak mutations in total.

Level 1

Mutation Description Location Upgrade
High Density 3-5 beat and 1-4 bullets resistance. Maas Neotek Lithodermis
Firewalker 5-8 burn, 1-4 radiation, and 1-4 acid resistance Sharpton Projects Solar Sponge
Rubberskin 3-6 electric and 1-3 acid resistance Maas Neotek Silicone Skin
Snakeskin 2-4 slash and 1-3 stab resistance Gangland Shopping Mall Eelskin
Yeti Skin 8-10 cold resistance and 100 chill resistance (immunity to cold status effect) Mountain Pass Yeti Fur

Level 2

Mutation Description Location
Eelskin +3 Swim, +2-2 electric, +2-2 stabbing and +1-2 slashing resistance. Greatly increases chances of breaking out of a hold. You need to pee 50% less, but you get thirsty 50% faster. Removes the speed penalty to melee from being underwater. Outside the Kraken's cave.
Lithodermis 1-2 beat and 2-2 bullet resistance, as well as resistance to brain damage, broken limbs, and knockouts. -3 to swim and climb, and since you're heavier you can carry less. Adamant Canyon
Silicone Skin 2-4 acid, 2-6 laser and 2-6 explode resistance. Your body becomes unhackable and ungibbable. Trauma kits become 40% less effective. the oasis in the Glass Mesa
Solar Sponge 1-3 Burn, 2-2 Irradiation, and 2-3 Laser resistance. Heal when hot/on fire (not by much though) Brawn and Brains increase when you are in daylight Mutually exclusive with Vampirism. ground zero in the Wasteland
Yeti Fur 5 - 5 cold and 1 - 2 beat resistance, +1 to brawn, -1 - -3 to fire resistance, yetis will not attack you. Brawn and Brains increases as you become colder. Stench becomes more effective when taken with this mutation. Weezer Dam

Focus mutationsEdit

Mutation Description Location
Carrie Allows you to light items (and people you are in combat with!) on fire using your mind, with damage being determined by a Focus roll. It also, oddly, works better if you are covered in blood. Using Carrie has a chance of causing mental illness, which is lowered by having the Solar Sponge mutation. Mutually exclusive with chiller. Players can use carry to cook raw meat they are carrying, thus eliminating any chance of getting food poisoning. Open Prairie
Chiller Allows you to freeze items and enemies, giving them the cold effect depending on your focus. Freezing items will encase them in a block of ice, which preserves them indefinitely if they are a consumable until the block of ice melts. Melting speed depends on the area's temperature. Getting the mutation makes you colder passively, countered by yetiskin or yetifur. You also get antifreeze vomit, which you can puke on yourself/someone else to preserve the items in their inventory. Mutually exclusive with carrie. Fort Griam
Fuck machine +1 Cool, -1 Climb, +4 Fuck. Gives you the fantasize command, which allows you to get horny on command. You can attempt to accelerate your orgasm, or orgasm spontaneously, with the cum command. There is also the engorge command which will cause a character without a dick to grow one, which will remain until death. This works for females, neuters, and guys who fuck up with the RDCD and get their dicks ripped off. Maas Neotek
Salamander +4 to Swim, +4 to Climb, -1 to Craft, +1 to Focus. Allows you to mend broken limbs. mend relies on a focus check and can heal slight amounts of damage. Behind Gator Boy in the Shoreline
Screech +2 Focus. Gives the ability to screech. Stuns your enemies and LACKS the possibility of damaging them. Chemical Plant
Writhing Smoke +2 Focus. Gives you the ability to exhale, which allows you to fill the room with black-green smoke, making it easier to flee. Abandoned Highway

Movement mutationsEdit

These mutations are mutually exclusive with the other mutations of their level. In other words, you can pick Phaser, Clairvoyance, or Leapfrog, plus its respective upgrade, and none of the others. The Leapfrog/Flight path is exclusive to Lithodermis, but now you can have High Density and still fly, making flight somewhat feasible.

Level 1

Mutation Description Location Upgrade
Phaser +1 Focus. Gives the ability to memorize any outdoor spot, and then phase to it as long as nobody is watching you or standing in your phase spot the Wasteland, south east at the very bottom Blink
Leapfrog -1 Brawn, -1-3 Beat resistance, +1 Dodge, lets you leap up/down stuff. leaping lets you instantly move in any direction that would normally require a climb. Leapfrog is dependent on Reflexes. Success allows you to instantly move in the chosen direction. Failure causes damage similar to a fall, including the possibility for broken limbs. Increases walking movement speed. Mt. Fisty Flight
Clairvoyance +3 Focus. Gives you the ability to leave your body and travel around HellMOO, without actually traveling. You are able to see psi shimmers while projected, and if there is too much psi in the room you can take damage. You can sweep to check for other clairvoyants in the same room, and if you can find them, you can damage them with pulse. You can also listen to conversations in the room if you pass a focus roll for each time someone says something. Clairvoyance now also allows you to see as you would while probing at all times, effectively eliminating the need for light sources. The Cave of All Souls Medium

Level 2

Mutation Description Location
Blink Gives you the ability to blink to a random place using focus. If your focus is high enough, you can also successfully
blink <area> for quicker transportation. If you fail the focus, you run the risk of telefragging or blinking to an undesired location. If someone else is in the tile you blink to, you will also telefrag. It has an interesting effect when combined with Hooligan.
The Labrynth (Heart of Necropolis)
Flight Gives you the ability to fly,climb,dive and land. The downsides to fly are the cold that affects you while in the air, and the chupacabras which will attack you while flying. skies above the necropolis gate.
Medium Allows you to seek out other players. +1 to Focus. The higher your focus, the more accurate the roll. If your focus is high enough, you will accurately pinpoint the area that they currently reside. However, if their focus is high enough, they will be able to either detect that someone is seeking them, detect who is seeking them, or even detect where they are being sought from. Seek your targets with care! top of dike (Stormfront Island)

Game Changing MutationsEdit

Mutation Description Location
Abomination Gives -2 brains, -2 cool, +1 endurance, +1 brawn, +3 fish, -2 pistols, -2 rifles, -6 persuade, 4-10 beat, 6-9 slash, 4-10 stab, 8-10 bullet, and 1-4 acid resist, inability to wear regular armor (low thickness limit), can devour corpses for healing, burrow allows you to log out in outdoor type rooms safely, acid jizz/piss, as well as a claws upgrade that gives you radiation damage on top of more normal damage. Anyone in the same room with you will become irradiated (You cannot be irradiated yourself), you can breathe underwater, you cannot be addicted to drugs, nanites are only 40% as effective, food will only fill you 20% as much as it did. Once you die, your corpse will explode shortly after, causing damage to anyone in the room. FCPD (and other law enforcement) will attack you on sight.

Requires: hideous freak, ripper, and fuck machine.

Chud Gives +1 senses, +1 fuck, +2 climb, -2 pistols, -2 rifles, minor beat, stab and slash soaks and some new commands: wail <text> to wail to other chuds within an area, or if no text is supplied, to wail for minions; and minions to show information about your current minions and reputation. A higher tier of reputation means better minions for you.

Incompatible with: hideous freak, vampire, and zombie.

Empath Gives +1 brains, +2 senses, +3 focus, and +2 medic, +3 to Medium's seek, an unknown bonus to Plant Whisperer's fertilize, allows massage which may relieve stress in someone else, and soothe which lets you absorb the mental illnesses of others. You gain small amounts of stress from being in a room with other people who are stressed. Killing humans and some other intelligent creatures will give stress and shock on a failed focus roll, with the difficulty going up based on how close you are to the dying creature. Requires Blink, Flight, or Medium, as well as Swollen Brain. berkeley psychic institute
Hideous Freak Gives you the ability to scare people, giving them fear and yourself frenzy. -3 to cool, +4 to senses, +1 to endurance, +3 sneak, -2 persuade, +4 torture, +3 focus. Makes shopkeepers fear you, disabling your ability to buy/sell. FCPD will kill you on sight. All stress effects are reversed. You also gain acidic blood.

Incompatible with: chud, vampire, and zombie.

the necropolis gate
Vampire Turns you into a permanent vampire. +4 to brawn, cool, endurance, and senses. -4 to brains. You will take damage from the sun if you are outside during the day, but only half as much as those who have the vampirism disease. You do not gain sustenance from normal food, and will have to drink the blood from your victims, using feed from. Typically you will have to hold them for this to work, though people can willingly allow you to feed from them. Whenever you kill something, usually blood will splatter, and you can feed from this by using lick blood or taste blood. Also: nightvision.

Incompatible with: hyperimmune, hideous freak, solar sponge, zombie, chud, and billygoat.

Adamant Canyon
Zombie Gives -6 brains, -2 brawn, +2 endurance, -10 sneak, +50 disease resistance, +100 zombie rot stage I resistance, +50 bleeding resistance, +25 burning resistance, -25 cold resistance, +75 addiction resistance, +100 suffocation resistance; Soaks: 3-6 beat, 5-10 bullets, 2-5 electric, 100-100 suffocation, 50-100 healing; lets you feed on corpses or severed heads, howl to summon the undead to your aid, and puke to puke bile on someone. Also, you are cloned in random locations and will re-animate after you die if you wait long enough. FCPD/other law enforcement will behead you if you die around them. Your weapon attack speed is capped at 4.5 seconds, as opposed to 2.5 for anyone else.

Incompatible with: billygoat, bleeder, brainslug, chud, hideous freak, hyperimmune, silicone skin, swollen brain, and vampire.

Necropolis Floodplains.

Other mutationsEdit

Mutation Description Location
Billygoat Can eat anything you can junk. Chance to barf up components from eaten items. No penalties from being full from eating non food. Eating food until you're full still gives you penalties.

Gives -1 to Endurance. +1 to Climb.

Incompatible with: vampire and zombie.

Crater Rim
Bleeder You gain the power to inflict bleeding wounds on yourself, but you will feel naked whenever you are not covered in at least a little blood. Additionally, bleeding wounds will cause you to enter a frenzy. You also no longer pass out from blood loss so bleed away.

Incompatible with: Superclot and zombie.

Princeton General
Bloodhound Your nasal cavities swell and grow thicker networks of nerve endings, enhancing tracking and overall sensory awareness.

+4 to track, +2 to senses

Mountain Pass
Brainslug Your forehead bulges and the skin ripples unnaturally. You feel a little sick when you notice a distinct lump pushing out just slightly. It stays.

+3 Brains, -2 Brawn, -1 Reflexes, +40 stun resistance.
New Commands:
slug <any> : Speak to the slugmind.
larva : Cough up a brainslug larva.

Brute Strength Thickened muscle tissue which boosts brawn, but hurts endurance a bit.

+3 to brawn, -1 to endurance, and +1 to wrestle for whatever reason.

Incompatible with: swollen brain.

In the Sewers, underneath Charnold
Camelfat Fat tissue reorganizes into a powerful water-storage medium. You'll get thirsty much more slowly. Drugs (both good and bad) will also take longer to work their way through your system.

Incompatible with: eelskin and iron liver.

Sea of Dunes
Enigma You are a complete mystery to others. People can't accurately determine how strong you are, or what ailments you suffer from. In fact, your mysterious aura is so thick that it sometimes effects your own senses. Coincidentally, this makes you pretty cool.

Gives +2 cool, -1 senses, you cannot be diagnosed or appraised by anyone, including yourself.

Back room of Heaven bar in Gangland.
Fibrocartilage +5 Max health, +95 resistance to 'all anti-aging methods.' (Currently just rejuvex). The extra +5 max health does not effect endocrine max or rolls, so you can freely take it at any point. Shoggoth Lair
Hooligan Something's...not right with your head. You have trouble focusing, and you're prone to bouts of brain damage. On the plus side, this makes it difficult to stun or distract you. It has a 'bonus' when combined with the Blink mutation.

Gives -3 focus, +35 stun resistance, +1 Wrestle. You get a headbutt command, with a chance of stun and damage based on your brawn. It uses the wrestle skill!

Nukem Academy - 2nd Floor
Hyperimmune The reaction time of your immune system increases tenfold, destroying viruses and bacteria before they have the chance to act out their intended purpose. However, any invader (helpful or harmful) is targeted, greatly reducing the effectiveness of nanites and making them almost useless.

+2 endurance, immunity to all diseases, 50 resistance to rad sickness, reduces effectiveness of nanite healers by 60%. All other drugs still work.

Incompatible with: vampire and zombie.

Subway Tunnels
Iron Liver Resistance to poison and alcohol, makes pleasure drugs and nanite healers less effective. 40 resistance to THC and speed, 25 resistance to nanite healers, 60 resistance to curare, 70 resistance to spider venom, 75 resistance to pcp, 50 resistance to alcohol.

Alcohol heals you 1-7 hp per heartbeat based off how drunk you are. Healing lasts for the duration of the drunk status effect.

Incompatible with: camelfat.

Chemical Plant
Junkrat Your keen eyes are able to spot hidden details invisible to others, and you are able to find something in a room like no other. However, your obssesive-compulsive ways are considered nerdy to most people. It's more difficult to find stuff in places where there is a stench, and sniff is now based on scavenge skill.

+1 Scavenge, -1 Cool, +1 Senses. Gives the sniff command which lets you find secret exits and attempt to locate a specific scavengable item in a room.

Requires: Bloodhound

Toxic Dump
Mule Pouches in your skin let you carry 30% more weight. However, you feel stressed and uncomfortable if your pouches aren't full enough. Sharpton Interior - Basement
Nimble Fingers Your fingers become extremely agile. On the other hand, you become a bit of a limp-wristed nerd and your bones become more brittle. You also gain the 'massage' command, which lets you massage stress out of other players.

+1 Locksmith and Craft, +2 Reflexes, -2 Endurance, -2-4 Beat protection.

Incompatible with: ripper.

the Sewers below the bug queen
Plant Whisperer With this mutation you can, well, talk to plants. Maybe they have something interesting to share. You can also attempt to fertilize (persuade) the plant to make it bear a harvest if it is empty [this is a persuade check]. You may have better results if you are an empath.However, you also become infertile.

More to come for this fantastic mutation at a later date. Stay tuned!

+1 Persuade, +100 Pregnancy Resistance

Crater Forest
Ripper Gives you claws. +1 to fist, +2 to climb, -5 to locksmith, -4 to craft, -3 to repair and medic, -1 to pilot and chemistry.

Incompatible with: nimble fingers.

the underground mine
Stench Grants the command Musk, which releases a musk which gradually wears off after 5 or 6 minutes. The musk prevents smelling monsters from aggroing you and grants a bonus to escape said monsters at the cost of minor stat/skill changes to senses and fuck. Furthermore, you become a little easier to track even when not musking, and much easier to track when actively musking. Sewers
Swollen Brain Enlarged corpus callosum, which makes you brainier and more sense-aware. Too bad it looks so un-cool.

+3 to brains, +1 to senses, -1 to cool.

Incompatible with: brute strength.

In the Sewers, across the bridge to the west. Requires two people to get across the bridge.
Third Nipple Unleash the awesome power of having three nipples at your command. You are able to tell peoples fortunes, and they come true! Rupture
Twitchy Nerves Mutates nerve fibers that provide enhanced reflexes, but make it a little harder to concentrate.

+2 Reflexes, -1 Senses, -2 Focus

Vault 4
Superclot Makes your wounds seal up instantly so that you can't bleed to death, and +2 Endurance. Weapons which bypass armor to cause direct bleeding damage, such as sonic scalpels, will still inflict damage against you, but won't cause you to bleed.

Incompatible with: bleeder.

Subway Tunnels
Xray Vision See through all kinds of shit. Your supersensitive eyes have a little trouble in the dark, however. Location temporarily moved to the bottom of the Abandoned Complex.

+1 medic, +1 scavenge, +1 locksmith. Xray <something> : Peer into closed objects, or other peoples inventory.

Abandoned Complex

Radiation Mutations Edit

These mutations can only be gained from reaching a certain amount of rads - you need around eight rads to gain a radiation mutation, and you can have more than one. These mutations are temporary; when you die you'll lose them. If you have high endurance you may shrug off getting the mutation. If you're specifically trying to get one of these mutations, the easiest way is to sit in a room with a few spent fuel rods until sufficiently irradiated. Failing that, you can wander around in an irradiated area such as the wasteland or the glass mesa, but both of these are more dangerous.

Mutation Effects Message when Acquired Visible Effects
chameleon +3 sneak, -1 reflexes Your skin feels briefly like it's on fire, and large black patches appear all over it. You look at your hand, and realize you can see the floor reflected on it. <name> is hard to get a fix on. They shift in and out of sight, seemingly at random.
downs syndrome brawn +1, brains -3 Duhhhurrr. The world abruptly seems much simpler <name>'s head is a funny shape, and <their> eyes are a little too far apart.
elephantitis -2 reflexes Your body shivers with pain, and your flesh starts to swell, straining your skin. Ugh. <name>'s flesh is blobby and swollen. Ick.
oozing sores -2 to your cool, will constantly leak radpus and occasionally a pusgrub, consuming the pusgrub may grant the consumer a mental disease <name> writhes in pain as huge, bubbling sores develop all over <their> body. <name>'s entire body is covered in huge, open sores leaking thick pus.
psychotic trauma (red eyes) +2 brawn, +2 reflexes, +1 senses, -4 cool Something in your brain snaps. Your vision tinges with red, and your face feels very itchy. <names>'s eyes no longer have any discernible features-- they are just solid red.
second head brains +1, cool -1 You feel a terrible pain in your shoulder-- feels like something is being rearranged. Then there's a lot of pressure on your skin, and with a pop, something appears. <name> has a second head on <their> shoulder. It is shrunken and underdeveloped, but its eyes occasionally focus on you.
slippery (strange-looking) skin +1 reflexes, -1 endurance Your skin suddenly feels like it's giving way, melting, but not. You move your arm and realize it makes you sort of 'flow'... very strange. <name>'s skin looks strange. It is slightly translucent, and appears to bead, like water, before breaking up again.
third arm Let's you triple-wield, but you can't wear clothes on your abdomen and occasionally drop what you're holding, Will also destroy any armour that covers your torso when you initially mutate it. <name> clutches <their> shoulder in agony as it twists and shudders, sprouting a bizarre protrusion that slowly forms itself into something resembling an arm. <name> has a disgusting mutated third arm growing from <their> shoulder.
third breast Seems to give a bonus to fuck. Only females can get this mutation. <name> thrusts her chest out and squeels in pain as a third breast forces itself out of her chest between her first and second. <name> has a third breast.
third eye +2 senses With a blinding flash of pain, the skin of your forehead splits, and then... you can see. Like never before. <name> has a third eye in the center of <their> forehead. It flicks about lazily.
third testicle Seems to give a bonus to fuck. Only males can get this mutation. <name> suddenly falls to his knees and grabs his groin, squeeling in pain. His eyes widen as his finds something extra. <name> walks with his groin thrust out slightly.
webbed hands +4 swim -3 craft <name> spends a few seconds looking at <their> hand confusedly, spreading <their> fingers and ogling a new flap of skin between each pair. <name>'s hands look a bit strange.

Mutation SlotsEdit

To acquire a mutation you require a free mutation slot (radiation mutations are exempt from this). You begin with one free slot. To gain additional mutation slots, you must acquire a set amount of XP (note however, that this looks at total acquired XP, not XP available for use). Your first two additional slots come at 4,000 XP intervals, then a third at 5000 additional XP, and a fourth 7000 additional XP. After this, 10,000 additional XP is required. There is no cap to the number of open slots you can have.

THIS IS NEW FOR AFTER THE END! Special thanks to bear for the info:

XP Slots
0 1
4,000 2
8,000 3
12,000 4
16,000 5
24,000 6
32,000 7
40,000 8
48,000 9
60,000 10
72,000 11
84,000 12
96,000 13
112,000 14
128,000 15
144,000 16
160,000 17
176,000 18
192,000 19
208,000 20
240,000 21
272,000 22
304,000 23
364,000 24

[You earned another mutation slot!]

Mutation Removal Edit

It's possible to remove your mutations now through a device on Stormfront Island. However, there are penalties that come with this: You age 10 years. Your health drops to 5 below the starting max, 25. You lose 1 raw from a random skill from your top three.

Defunct Mutations Edit

The following is a list of mutations that are no longer available.

Mutation Effect Reason for Removal
Jammer Nullified all focus mutations used in the same square. -10 focus Negated by other changes