Mixed All levels biomesforest

The five biomes: forest, desert, snow, swamp, Underrealm

Five biomes are confirmed. Official alpha footage adds named places: White Hollow in the Harmoniyan Lands, and Black Fen in the Kabariah Swamp. Here is what each terrain is likely to demand — with the names we can actually source.

Updated 2026-11-06 8 min read Fact-checked 2026-11-06

Why terrain matters more than the palette

In an isometric ARPG, a biome is a set of movement and visibility problems dressed as scenery. Trees block projectiles. Snow hides ground effects. Swamp water slows you. A desert gives you nowhere to break line of sight. The Underrealm is the developer’s chance to break the rules entirely.

Confirmed biomes and the questions they raise
BiomeConfirmed lookLikely pressure (theory)
ForestDense green canopy, roots, small clearingsProjectile blocking, ambushes from off-screen, tight corridors
DesertOpen sand, rock outcrops, strong lightLong sightlines, ranged enemies, little cover from projectiles
Snow peaksBlue-white ridges, snowfall, iceVisibility, ground-effect readability, slow movement
SwampWater, reeds, drowned structuresMovement speed, poison/area denial, narrow paths
UnderrealmBuried crypts and underground spacesEnclosed fights, doorways, minion pathing, light
Harmoniyan LandsA named region seen in a snow screenshotUnknown; likely a story region rather than a biome

Only the biome list is official. The pressure column is genre inference. The Harmoniyan Lands and White Hollow are observed location names, not confirmed biome categories.

Named places in the alpha

Observed location headers
ZoneRegion / stateBiomeSource
White HollowThe Harmoniyan Lands: Blue HourSnowOfficial screenshot
Black Fen(The) Kabariah Swamp: Witchlight FenSwampOfficial alpha loop
Unknown—Forest, desert, UnderrealmStore confirms biomes, not names

Spelling copied from the pixels: “Harmoniyan”, “Kabariah”. The left edge of the Black Fen header is cropped, so the article is uncertain. These are alpha labels and may change.

Forest: the projectile maze

The store screenshot with the Glade Sprite fight is a forest floor: dense green, large roots and a screen full of damage numbers. The practical question is whether the canopy blocks arrows and spells or is purely decorative. If it blocks, a Ranger loses value and a melee class gains it.

  • Watch for enemies entering from behind a tree, not from the edge of the screen.
  • Keep a close-range answer even on a ranged build.
  • Do not assume a clear path; roots and water can funnel you into a pack.

Snow: the readability test

The White Hollow screenshot is the clearest look at a snow Rupture: blue-white ground, falling snow, a bright cyan skill effect and a lot of particle noise. The danger is not cold damage; it is that a white ground effect on white snow is hard to see.

Desert: the ranged problem

An open desert removes the forest’s accidental cover. If enemies have projectiles, you will see them coming — and they will see you. This is where a melee build wants a gap-closer and a ranged build wants a way to break line of sight.

Swamp: the movement tax

Swamps in ARPGs usually charge a movement tax: water slows you, reeds hide enemies, and the ground itself is a hazard. The official art shows drowned fens in the store description, not a gameplay screenshot, so the specifics are unknown. Treat movement speed as a defensive stat until proven otherwise.

Underrealm: the corridor test

The Underrealm is the biome most likely to break a summoner or a projectile build. Every ARPG has a doorway that turns a minion army into a traffic jam. If the Underrealm is as enclosed as its name suggests, test minion pathing and projectile collision before you commit to a build that depends on open space.

A biome-ready checklist

  • One skill that works in a corridor, even if it is not your main.
  • One skill that works at range, even if it is not your main.
  • A movement skill that does not require a target.
  • A way to see ground effects on a bright or busy background.
  • A plan for enemies that attack from outside the screen.

Frequently asked questions

How many biomes are in Broken Oath?
Five are confirmed: forests, deserts, snow peaks, swamps and the Underrealm.
Are biomes randomly generated?
The store says Ruptures are randomised maps across the biomes and reshaped every time you enter. The exact generation rules are unpublished.
What is White Hollow?
A location name visible in an official snow screenshot, alongside “The Harmoniyan Lands: Blue Hour” and “Monster Level 40”. It has not been described by the developer.
Is there a fire or lava biome?
Not among the confirmed five. A screenshot shows embers and burnt ground, but that could be a modifier, a skill effect or part of the Underrealm.
What is Black Fen?
A location shown in official alpha footage: “Black Fen” with the header “Kabariah Swamp: Witchlight Fen”, Monster Level 70. It is the arena for the Guardian Elysia's Ashen Wyrm.

Sources

  1. Steam store page — biome list
  2. Official screenshot — White Hollow snow Rupture
  3. Official screenshot — forest encounter
  4. Official alpha loop — Black Fen / Kabariah Swamp: Witchlight Fen