Biomes derive from elevation and climate: below 1.2 m is beach, above 26 m snow or mountain, cold regions snow, hot regions desert, wet ground forest, the rest plains. Terraform edits that raise or lower land shift its default biome automatically. Towns and camps can override the biome around them in the Towns & Camps builder.

Each row is a node type's density in this biome — 100% is the natural baseline (its share of spawn rolls is the small number), 200% doubles it, 0% removes it. Uncheck to ban the type. Types marked "—" aren't natural here: check one to add it to the biome at a small share (+5%), then tune it with its slider. Overall density scales everything at once.

Pick which creatures roam this biome. Custom creatures come from the Mob builder. Aggressive wildlife keeps clear of towns.