Biomes are weather for your luck: the game rerolls the island's state every second, and when Windy, Hell, Starfall, or another biome lands, its native auras temporarily drop at far better odds. Reading the biome announcement in chat and switching targets is the closest thing Sol's RNG has to a skill ceiling.
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Biome tier
Standard Biomes
The naturally cycling weather states, from constant Windy to the rarer Corruption and Null.
Normal
The default grassy island with no weather effects and no biome-locked auras.
- How it appears
- Active whenever no other biome is rolling; the biome system rerolls every second.
Windy
A cool wind sweeps the island while leaves whip off the trees.
- Spawn chance
- 1 in 500 per second
- Duration
- 2 minutes
- How it appears
- Spawns naturally from the every-second biome roll.
- Native auras
- Wind, Flow, Stormal, Vortex, Aviator, Stormal : Hurricane, Maelstrom
Snowy
Snow and cold cover the map in white.
- Spawn chance
- 1 in 600 per second
- Duration
- 2 minutes
- How it appears
- Spawns naturally from the every-second biome roll.
- Native auras
- Glacier, Permafrost, Blizzard, Chillsear, Eisveil
Rainy
Showers and gray fog roll through, powering water auras.
- Spawn chance
- 1 in 750 per second
- Duration
- 2 minutes
- How it appears
- Spawns naturally from the every-second biome roll.
- Native auras
- Evanescent, Poseidon, Aquaria, Sailor, Sailor : Flying Dutchman, Sharkyn, Abyssal Hunter, Lumenpool, and more
Sandstorm
A harsh sandstorm blankets the map in dust.
- Spawn chance
- 1 in 3,000 per second
- Duration
- 650 seconds
- How it appears
- Spawns naturally from the every-second biome roll.
- Native auras
- Gilded, Jackpot, Gilded : Crowned, Anubis, Outlaw, Atlas
Hell
Chaotic red energy overtakes the world.
- Spawn chance
- 1 in 6,666 per second
- Duration
- 666 seconds
- How it appears
- Spawns naturally from the every-second biome roll.
- Native auras
- Undead, Undead : Devil, Hades, Hellbound, Bloodlust, Felled, Pythios
Starfall
A dark blue sky with stars pouring down.
- Spawn chance
- 1 in 7,500 per second
- Duration
- 10 minutes
- How it appears
- Spawns naturally; each Starfall spawn also has a 1 in 100 chance to become Singularity instead.
- Native auras
- Starlight, StarRider, Astral, Orion, Stargazer, Starlight : Kunzite, Sirius, Starborn, and more
Heaven
A divine golden sky opens above the island.
- Spawn chance
- 1 in 7,777 per second
- Duration
- 240 seconds
- How it appears
- Spawns naturally from the every-second biome roll.
- Native auras
- Divinus : Angel, Hope, Divinus : Guardian, Faith, Dominion, Icarus, Oculus, Archangel, and more
Corruption
Poisonous pollution spreads across the map.
- Spawn chance
- 1 in 9,000 per second
- Duration
- 650 seconds
- How it appears
- Spawns naturally from the every-second biome roll.
- Native auras
- Hazard, Corrosive, Hazard : Rays, Parasite, Symbiosis, Impeached, Monarch
| Name | Description | Spawn chance | Duration | How it appears | Native auras |
|---|---|---|---|---|---|
| Normal | The default grassy island with no weather effects and no biome-locked auras. | - | - | Active whenever no other biome is rolling; the biome system rerolls every second. | - |
| Windy | A cool wind sweeps the island while leaves whip off the trees. | 1 in 500 per second | 2 minutes | Spawns naturally from the every-second biome roll. | Wind, Flow, Stormal, Vortex, Aviator, Stormal : Hurricane, Maelstrom |
| Snowy | Snow and cold cover the map in white. | 1 in 600 per second | 2 minutes | Spawns naturally from the every-second biome roll. | Glacier, Permafrost, Blizzard, Chillsear, Eisveil |
| Rainy | Showers and gray fog roll through, powering water auras. | 1 in 750 per second | 2 minutes | Spawns naturally from the every-second biome roll. | Evanescent, Poseidon, Aquaria, Sailor, Sailor : Flying Dutchman, Sharkyn, Abyssal Hunter, Lumenpool, and more |
| Sandstorm | A harsh sandstorm blankets the map in dust. | 1 in 3,000 per second | 650 seconds | Spawns naturally from the every-second biome roll. | Gilded, Jackpot, Gilded : Crowned, Anubis, Outlaw, Atlas |
| Hell | Chaotic red energy overtakes the world. | 1 in 6,666 per second | 666 seconds | Spawns naturally from the every-second biome roll. | Undead, Undead : Devil, Hades, Hellbound, Bloodlust, Felled, Pythios |
| Starfall | A dark blue sky with stars pouring down. | 1 in 7,500 per second | 10 minutes | Spawns naturally; each Starfall spawn also has a 1 in 100 chance to become Singularity instead. | Starlight, StarRider, Astral, Orion, Stargazer, Starlight : Kunzite, Sirius, Starborn, and more |
| Heaven | A divine golden sky opens above the island. | 1 in 7,777 per second | 240 seconds | Spawns naturally from the every-second biome roll. | Divinus : Angel, Hope, Divinus : Guardian, Faith, Dominion, Icarus, Oculus, Archangel, and more |
| Corruption | Poisonous pollution spreads across the map. | 1 in 9,000 per second | 650 seconds | Spawns naturally from the every-second biome roll. | Hazard, Corrosive, Hazard : Rays, Parasite, Symbiosis, Impeached, Monarch |
Biome tier
Rare Biomes
The heavy hitters: rarer spawns, special entry rules, and the most valuable native pools.
Glitched
The world breaks into error textures and corrupted terrain.
- Spawn chance
- 1 in 30,000 per second
- Duration
- 2 minutes
- How it appears
- Spawns naturally from the every-second biome roll; the rarest naturally rolling biome tier starts here.
- Native auras
- Fault, Glitch, Oppression
Dreamspace
A sleepy pastel dream world takes over the island.
- Spawn chance
- 1 in 3,500,000 per second
- How it appears
- The second rarest biome; it can also appear from biome items.
- Native auras
- ★, ★★, ★★★, Borealis, Dreammetric
Cyberspace
A digital grid world hosted by Jake, with a 2x breakthrough multiplier.
- Spawn chance
- 1 in 5,000 per item use
- Duration
- 12 minutes
- How it appears
- Cannot spawn naturally; it has a 1 in 5,000 chance when using a Strange Controller or Biome Randomizer.
- Native auras
- Forbidden, Player, Metabytes, Player : Respawn, Virtual, Antivirus, Matrix, Virtual : Fatal Error, and more
Singularity
A collapsing void that pulls everything in, home of Limbo-grade auras.
- Spawn chance
- 1 in 100 per Starfall spawn
- Duration
- 20 minutes
- How it appears
- Replaces Starfall 1 in 100 times whenever Starfall spawns, whether naturally or from biome items.
- Native auras
- Constella, Pleiades, Pulsar, Comet, Astronaut, Galaxy, Vega, Centurion, and more
| Name | Description | Spawn chance | Duration | How it appears | Native auras |
|---|---|---|---|---|---|
| Glitched | The world breaks into error textures and corrupted terrain. | 1 in 30,000 per second | 2 minutes | Spawns naturally from the every-second biome roll; the rarest naturally rolling biome tier starts here. | Fault, Glitch, Oppression |
| Dreamspace | A sleepy pastel dream world takes over the island. | 1 in 3,500,000 per second | - | The second rarest biome; it can also appear from biome items. | ★, ★★, ★★★, Borealis, Dreammetric |
| Cyberspace | A digital grid world hosted by Jake, with a 2x breakthrough multiplier. | 1 in 5,000 per item use | 12 minutes | Cannot spawn naturally; it has a 1 in 5,000 chance when using a Strange Controller or Biome Randomizer. | Forbidden, Player, Metabytes, Player : Respawn, Virtual, Antivirus, Matrix, Virtual : Fatal Error, and more |
| Singularity | A collapsing void that pulls everything in, home of Limbo-grade auras. | 1 in 100 per Starfall spawn | 20 minutes | Replaces Starfall 1 in 100 times whenever Starfall spawns, whether naturally or from biome items. | Constella, Pleiades, Pulsar, Comet, Astronaut, Galaxy, Vega, Centurion, and more |
How biome rolls work
The biome system rolls once per second against each biome's spawn chance, announces winners in chat, and runs the biome for its listed duration before falling back to Normal. Common biomes like Windy and Snowy cycle constantly, while the rare tier is measured in millions of per-second rolls. Two of the rare biomes bend the rules: Cyberspace only appears through biome items, and Singularity replaces one in every hundred Starfall spawns.
Playing the windows
A biome window is a timed discount on its native auras, so preparation beats reaction: keep potions banked and a target list per biome, then spend the window rolling instead of shopping. Biome items like the Biome Randomizer and Selector let late-game players force windows instead of waiting, which is also the only practical route into Cyberspace and its exclusive auras.
- Learn the chat colors of the biomes you care about and mute the rest.
- Match your chase list to biome durations; a 99-second Null window is not the time for a million-roll target.
- Treat Starfall spawns as lottery tickets for Singularity, and be ready when it hits.
FAQ
How do biomes spawn in Sol's RNG?
The game rolls every second against each biome's chance. Most spawn naturally, but Cyberspace needs a Strange Controller or Biome Randomizer, and Singularity replaces 1 in 100 Starfall spawns.
Do biomes affect all auras?
No. Only a biome's native and exclusive auras get better odds while it is active; everything else keeps its normal base chance.
Can you force a biome?
Yes, with biome items like the Biome Randomizer and Biome Selector, which trigger biome rolls on demand and are the main way to reach Cyberspace.
