Amphibian

Amphibian mutants were transformed in order to combat various monstrosities of the seas and lakes, as well as those they may find on solid ground.

Amphibian Features. You can see clearly underwater, and can see in underwater areas of dim light or darkness as if it were bright to a range of 120 feet. Additionally, you can choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Aquatic Adaptations. You gain a swim speed of 30 feet, and can breathe both air and water.

Natural Swimmer. You gain proficiency in the Athletics skill. Additionally, when making an Athletics check involving swimming, you can add double your proficiency bonus, instead of any proficiency bonus you normally apply.

Arachnid

Arachnid mutants were created by denizens of the Underdark, designed to be perfect hunters, capable of traversing the underdark on any surface to kill, in any kind of lighting.

Arachnid Features. Your arachnid mutations have given you an uncanny ability to climb. You gain a climbing speed of 30 feet. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

See Through The Web. Capable of sensing vibrations in the ground around you, you gain tremorsense out to a range of 15 feet.

Spider Climb. You can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check. You must still use at least one hand and one foot, or two hands, to climb.

Avian

Avian mutants were transformed to create perfect watchmen, using their hawk-like vision to spot targets from incredible distances prior to engagement.

Avian Features. As a result of the mutations, you’re acclimated to high altitude, including elevations above 20,000 feet. You also can attack at long range without disadvantage on your ranged weapon attack rolls. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Emissary of Flight. Airborne beasts have an extraordinary affinity with you due to your mutations. You can communicate simple ideas with beasts that have a flying speed. They can understand the meaning of your words, though you have no special ability to understand them in return.

Keen Eye. You gain proficiency in the Perception skill. Additionally, when making a Perception check to see extremely distant objects or creatures, you can add double your proficiency bonus, instead of any proficiency bonus you normally apply.

Canine

Canine mutants were transformed via experiments intended to create perfect hunters and trackers, gaining wolf-like features and a love of the hunt.

Canine Features. As a result of the mutations, your canine teeth become slightly longer and sharper. You can use them to make an unarmed attack, if you hit with it, you deal piercing damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Hound's Sense. Your senses are impeccable. You gain proficiency in the Survival skill. You can add double your proficiency bonus to checks made with this skill.

Wild Awareness. You gain proficiency in the Perception skill.

Chiropteran

Chiropteran mutants were transformed to be perfect hunters in dark or dim lighting, protecting civilizations from night terrors without needing sight.

Chiropteran Features. As a result of your mutations, you are capable of differentiating the difference between facing north or south. You also have advantage on Wisdom (Perception) checks that rely on hearing or smell. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Echolocation. You have blindsight out to a range of 20 feet, so long as you aren't deafened.

Keen Hearing. When making a Perception check relying on hearing, you can add double your proficiency bonus, instead of any proficiency bonus you normally apply.

Feline

Feline mutants were transformed as a way to create skilled fighters naturally suited to assassination, using feline agility and climbing claws to evade traps and reach targets.

Feline Features. As a result of the mutations, your eyes narrow to slits when inside of or looking into areas of bright light, and dilate when in dim or dark light. In addition, you have advantage on any Strength (Athletics) or Dexterity (Acrobatics) check you make to escape from being grappled. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Cat's Claws. Your fingernails sharpen into claws, allowing you to deal slashing damage with your unarmed strikes, and giving you a climbing speed equal to your walking speed.

Cat's Grace. You are agile and light of foot. You gain proficiency in the Stealth skill, and you can use a bonus action on each of your turns to take the Dash action.

Illithian

Illithian mutants are created by two processes. First, a creature is subjected to the process of ceremorphosis, where a humanoid creature is converted by a tadpole into a mind flayer. Later, it is subjected to the mutations that interrupt the process, kill the tadpole, and strengthen its body. The result is a creature singularly capable of using and opposing psionics.

Illithid Features. As a result of the mutations and partial ceremorphosis, you can always tell when an effect is psionic in nature or not. In addition, you have advantage on saving throws against being charmed. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Steel Mind. You have resistance to psychic damage, and have advantage on Intelligence saving throws.

Touch of the Mind. You know the mage hand and message cantrips. When you cast mage hand with this trait, the hand is invisible. When you cast message with this trait, you can do so without components. You can cast either of these spells as bonus actions.

Ophidian

Cold and calculating, ophidian mutants were created as a way to infiltrate Yuan-Ti societies to play the elusive snake-people at their own game. These mutants tend to find intelligent solutions to problems, or favor deception, in issues they encounter.

Ophidian Traits. As a result of the mutations, your eyes become slitted like a snake's. Also, your fanged maw is a natural weapon, which you can use to make unarmed strikes. If you hit with it, you deal poison damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Poisonous Acclimation. You are well adjusted to toxins, granting you resistance to poison damage, and advantage on saving throws to resist the effects of poisons.

Snake's Blood. Your very blood is poisonous, allowing you to use your blood as a basis for poisons you craft. Doing so halves the material cost of the poison, and deals 1 point of damage to you.

Ursine

Ursine mutants are mutated with concoctions derived from the genetics of bears, designed to be the perfect intimidating bruisers capable of taking on foes considerable larger than themselves. These mutants tend to be bulkier than their peers.

Ursine Features. You have a bulky and strong frame as a result of your mutations. You count as one size larger for the purposes of determining carrying capacity and the weight you can push, drag and lift, as well as the size of creature you can grapple. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Bear's Strength. You are adept at standing your ground. You are immune to effects that would force you to move without a saving throw, and have advantage on all saving throws and ability checks to resist being forced to move or knocked prone.

Imposing Form. You know how to use your size to your advantage when dealing with creatures. You gain proficiency in Intimidation.

Draconian

Transformed to be exceptionally skilled at fighting magic-users, draconian mutants were created with various forms of draconic genetic samples. They may find a special kinship with dragonborn, though many would fill the same role as a half-elf in dragonborn society, being seen as a vile cross-breed.

Draconic Features. As a result of the mutations, your eyes take on a draconic appearance, and your fingernails form into small, blunt talons. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Arcane Insulation. You can use a reaction to give yourself advantage on one saving throw against a spell or magical effect once, and regain the ability to do so when you complete a short rest.

Natural Magician. You gain proficiency in the Arcana skill. Additionally, you learn one cantrip of your choice from the sorcerer spell list. You use Charisma as your spellcasting ability for this spell.

Simian

Simian mutants were created by altering and regressing the human lineage, allowing for primal endurance and strength to lead these fighters to victory. It is possible for some Simian mutants to blend into normal society due to their more subtle differences in physiology compared to other mutants.

Simian Features. Your extremities have become much more dexterous and agile due to your mutations. You can easily grasp walls and terrain, giving you a climbing speed of 30 feet. Additionally, you may choose to inherit other traits, both physical and behavioral. These are listed in the table below.

Natural Athlete. You have proficiency in the Athletics skill, as well as improvised weapons.

Primal Endurance. Whenever you take the Dash action in combat, you can spend one Hit Die to heal yourself. Roll the die, add your Constitution modifier, and regain a number of hit points equal to the total (minimum of 1). This ability can be used a number of times equal to your Constitution modifier (minimum of 1) per long rest.

You also have advantage on saving throws against exhaustion.

Bovine

Bovine mutants are created with potions and poisons based on the physiology of beasts of burden, such as bulls, bison, or buffalo. These mutants are massive and hardy, capable of taking many hits and charging through foes to reach their goal.

Bovine Features. Due to your mutations, your body is stronger and stouter than the average human. You count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.

Charge. If you move at least 10 feet in a straight line immediately before taking this bonus action, you either gain a bonus to the attack’s damage roll equal to your proficiency modifier (if you chose to make a melee attack and hit) or push the target up to 10 feet away from you (if you chose to shove and you succeed).

Vampiric, Ooze, Fiendish, Fungal, Plantoid, Elemental, Suidae

Feats

This section contains new feats to supplement those in the Player's Handbook. These feats represent additional mutations, or augmentations to existing mutations, that some mutants discover to improve their natural abilities.