A bearsnake is mutant black bear, taller and heavier than the base species. The lower legs are atrophied, and the tail has extended into a complete snakelike trunk. Bearsnakes are not very fast, but their thick skin and extremely thick fat layer make them extremely resistant to damage. Bearsnakes travel through the Boston Commonwealth, eating everything in their path.

Known Populations Edit

There are two known groups in the Commonwealth: four or five individuals currently around Salem and a pair or trio in the Pawtucket ruins.


Greenskins are a common mutant phenotype in the Commonwealth}. They are humanoids, generally 8-10' tall, heavily muscled, with dull green skin. They seem to be less intelligent than the average human, and don't readily produce or repair advanced weapons, though some of them have scavenged rifles (especially from their kills) and are adept at shooting. Most others prefer melee weapons.

Greenskins cluster in small tribes, from a dozen individuals to upwards of thirty. They are apparently resistant to radiation, and are comfortable living in ruined cities and are sometimes spotted in radioactively hot craters. They also eat less than their size would indicate, which perhaps explains why they can live in the ruined cities that don't generally produce enough food.

Many greenskins act as bandits and raiders, assaulting scavengers and small traders. Several tribes will sometimes band together and assault a town.

Infrequently, the smaller and smarter greenskins will separate from their tribe and attempt to connect with a settlement. Though they face a lot of fear and mistrust, some persevere and accepted as productive members of the community. There are rumors of a entire settlement of greenskins in the Littleton Desert.

Known Populations Edit

The Back Bay Greenskins are a large tribe that lives near the former Back Bay of Boston, near Diamond City.


Loblops are a form of mutant lobster, roughly 8' long from claws to tail. They are an ambush predator on land, burying into sand or loose earth and then erupting out to snare small game or even humans. Loblop chitin is prized for its strength and resilience, but that same strength makes it difficult and dangerous to hunt them.

Known Populations Edit

Loblops are most common on the Commonwealth's east coast and the north coast of Cape Cod. They are especially prevalent around Unstable. Strangely, they are rarely seen inside the ruins of Boston.


Mirelurks are a form of mutant crab. They have an enormous thorax, roughly 4' in diameter, and two large claws. They are not intelligent, though there are rumors and sightings of taller, more man-like mirelurks that are. Mirelurks are aggressive, opportunistic scavengers and a deadly nuisance in the beaches and swamps of the Boston Commonwealth. The upper surface of mirelurk shells are resistant to low-caliber bullets, but their undersides are softer and weaker.

Known Populations Edit

Mirelurks are common on the Commonwealth's south coast. They are fairly rare in the Providence River, but become very common in the Narrangansert Bay and points south. Mirelurks are sometimes found on the east coast and more often near Unstable.

Mutant Living Roadway Edit

The highways and interstates of the Commonwealth were made from genetically engineered trees that could only grown on a bed of sprayable ceramic catalyst. Once planted, the living roadway absorbed carbon dioxide and sunlight to repair itself, and nanobot pruners kept the surface level and helped expel toxins outside the roadbed. Rainfall was absorbed into the road's surface and flooding rains were pumped to the roadside.

Most of the living roadways continue to maintain themselves and provide excellent, smooth and metaled roads throughout the Commonwealth. However, some of the living roadway sections were mutated, either by the bombs or by deliberate nanoviruses. The two most common mutations are stuckfoot and clubber.


The surface of a Stuckfoot colony extrudes a strong glue that captures most things that touch it. The colony detects the pressure and then changes its biochemistry to produce a strong acid that dissolves most carbon bonds. The unlucky victim is slowly digested. Stuckfoot is horrible and terrifying, but immobile and relatively easy to spot by the presence of trapped and dying birds on the road surface.


Clubber colonies can produce pseudopod tentacles, up to four yards long, which the road uses to beat its prey to death and then drag the corpses to the road surface for digestion. Clubber colonies are not (as far as anyone knows) intelligent, but they do possess a certain cunning and will let intruders travel quite far onto the road before forming pseudopods and attacking. Clubber tentacles can move faster than a running man for brief periods.

Known PopulationsEdit

I-93 from Quincy north to Boston is a Stuckfoot colony, as are most of the highways around Providence, Rhode Island. There are Clubber colonies on I-95 near the ruins of Worcester and on US-1 near the ruins of Lynn. Small Stuckfoot and Clubber colonies are common in the dying roads of the Littleton Desert, and its safe to assume that any healthy looking living roadway in the Desert is one or the other. Both Massachusetts 28 and US-6 near Unstable are known to be Clubber colonies.

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