Only the brave or foolhardy dare even the briefest foray into Underland, and few survive such treks long enough to make a habit of it. Underlanders are survivors through and through, having known the leanest of times in tunnels home to monsters and deadly traps alike. The harshness of subterranean life makes Underlanders extremely cautious about whom they trust, but once they form a bond with someone, their loyalty is ironclad. At the same time, Underlanders can be incredibly patient when danger is near—but when the moment to strike is at hand, theirs is sure.

Characters raised in the Underlander culture share a variety of traits in common with one another.

Ear for Echoes. You have blindsight out to a range of 10 feet. If you already had blindsight, its range increases by 10 feet.

Eat Like a Bird. You grew used to eating very little. You can go a number of days equal to half your Constitution modifier without suffering any fatigue from lack of Supply .

Tunnel Finder. You have advantage on checks made to navigate underground.

Superior Darkvision. You have darkvision out to a range of 60 feet. If you already had darkvision, its range increases to 120 feet instead.

Underlander. You gain an expertise die on checks made for journey activities while in Underland.

Languages. You can speak, read, write, and sign Common and Undercommon.

One of the most difficult aspects of life in Underland is finding enough food to eat—or protecting what food one can find. An underharvester is someone who’s mastered the practice of gathering food in the harshest of environments, learning by painful experience (or wise lessons) what food is safe to eat. Mushrooms in particular are a valuable resource for underharvesters, something they take with them whenever they travel to a new area. Whiling away so many hours in the quiet darkness makes underharvesters an introspective lot, as does their penchant for using mushrooms to make their lives more enjoyable. underharvesters use mushrooms in ways many others find quite odd, from mildly poisoning themselves to stay warm in the subterranean cold, filling their bellies with mushrooms with no nutritional value in order to stave off hunger pangs, or ingesting hallucinogenic spores for recreation or religious purposes.

Characters raised in the underharvester culture share a variety of traits in common with one another.

Expert Forager. Once per long rest , you can spend 4 hours of time to locate Supply for yourself and one other creature, or magical reagents worth up to 5 gold.

Shroomfinder. You gain advantage on checks made to find and identify mushrooms, as well as on checks made to cook mushrooms or use them as alchemical ingredients. In addition, you gain an expertise die on attack rolls and saving throws against plant creatures.

Sporekeeper. You keep on your person a number of pouches filled with various kinds of mushroom spores. When you have access to these pouches and use a medicinal, the medicinal’s duration is doubled.

Languages. You can speak, read, write, and sign Common and Undercommon.

The oceans of Underland are sailed by an eclectic mix of merchants, pirates, explorers, adventurers, and agents of the various underground factions. While less affected by extreme weather than their surface counterparts, these subterranean seas possess hazards of their own, and those who sail them (and survive) are made resourceful and resilient indeed. Sunless mariners spend most of their lives on (or under) the water, operating boats and submarines on the shipping lanes that link Underland’s ports. Crews of sunless mariners are sometimes all one heritage, but more often they are an eclectic mix of the people who make their homes underground. Elves, grimlocks, gnomes, dwarves, ratlings, and many others live side by side on these vessels, combining their talents to prevail against the unforgiving depths.

Unlike surface-world sailors, sunless mariners always know how to swim. It is not uncommon for a contingent of mariners to swim alongside their vessel, hauling it with ropes through narrow passages. Many ships that sail the sunless seas feature airlock-like chambers or magical fields that allow humanoids to enter the ship beneath the water.

Characters raised in the sunless mariner culture share a variety of traits in common with one another.

Resilient Lungs. Repeated underwater forays have strengthened your lungs. You can hold your breath for twice as long as normal.

Lightless Perception. If you do not have darkvision, you gain darkvision with a range of 60 feet. If you already have darkvision, its range increases to 120 feet.

Strong Swimmer. You gain an expertise die on Athletics checks related to swimming.

Sailor. You gain proficiency with water vehicles.

Water Magic. You know the mending cantrip. Once you reach 3rd level, you can cast gust of wind once per long rest . You can cast these spells without components, and when casting them your spellcasting ability is your choice of Intelligence, Wisdom, or Charisma.

Languages. You can speak, read, write, and sign Common and Undercommon. You can also read and write Grimlock texture writing.

Sewer rats are ratlings who live by their wits in the most inhospitable parts of cities. They venture out at night in search of food and other necessities, stealing whatever they can’t scavenge. Able to wriggle through tiny spaces and laughing at locks, sewer rats operate much like a thieves’ guild—albeit one more interested in food than riches.

Sewer rats make no distinction between scavenging from garbage piles and stealing from bakeries and warehouses. If something’s not being used, it’s fair game. It’s hard to keep rats out of a storeroom, especially if the rats have nimble brains, access to thieves’ tools, and more than a passing familiarity with magical defenses.

When sewer rats do take something valuable, they’re happy to return it. Tolerant cities sometimes host a “sewer rat bazaar” where owners of stolen items can reclaim their property in exchange for colorful feathers or sweet treats.

While most sewer rats are ratlings, any humanoid willing to turn their back on polite society may be welcomed into a sewer rat enclave. Fugitives, exiles, and orphans alike can find companionship among a ratling family.

Characters raised in the sewer rat culture share a variety of traits in common with one another.

Dirty Rat. You make saving throws against disease with advantage .

Maze Runner. You can’t become lost while retracing a route within 10 feet of a wall or cliff.

Sewer Born. You gain either a swim speed or a climb speed (your choice) equal to your Speed.

Sewer Sneak. You are proficient with thieves’ tools and your choice of the Arcana, Acrobatics, Athletics, or Stealth skill.

Languages. You can speak, read, write, and sign Common and one other language.