The five bands
Each biome has its own ore, its own monster palette, and its own reason to visit. Gaps between bands (floors 20, 40, 60, 80) are transition floors.
| Biome | Floors | Signature ore |
|---|---|---|
| Upper Mines | 1–19 | Copper |
| Tide Caverns | 21–39 | Iron |
| Deep Earth | 41–59 | Silver |
| Lava Caves | 61–79 | Gold |
| Ancient Ruins | 80 and below | Mistril |
The elevator is the whole progression system
An elevator connects every fifth floor — 5, 10, 15, 20 and so on — to the ground floor, once you have reached that floor at least once. Elevator floors use a set layout, although the rocks and monsters on them still vary. Practical consequence: your goal on any given run is to reach the next multiple of five, not to survive as deep as possible.
Special floors you will meet
Not every floor is a plain fight-and-descend layout, and recognising the exceptions saves a lot of wandering.
| Floor type | What it does |
|---|---|
| Fountain floors | Restore 20 health and 20 stamina |
| Treasure rooms | Spawn extra ore and chests; opened by the Treasure Hunter perk |
| Ritual chambers | Contain urns with cosmetics and artifacts; opened by the Lost to History perk |
| Locked ladder floors | Require a lever to be activated before you can descend |
| Whirlpools | Transport you between linked locations |
All biomes share a base drop set
Every biome contains plain rocks that drop stone, peat, sod and clay, so you are never mining purely for the biome ore. Monsters can also drop pet skins and hats across all five bands.
The mines are also how you unlock magic
Every spell in the game is gated on mine depth. Caldarus grants your first spell at Floor 10, and each new biome unlocks another — Summon Rain at the Tide Caverns, Growth at the Deep Earth, Dragon’s Breath at the Lava Caves, and the last two from the Priestess in the Ancient Ruins. If magic is what you want, descending is the only route to it.
What to bring
Food, empty inventory space, and armour appropriate to the band. Fainting is not catastrophic — you keep your items and Tesserae — but the day ends immediately, which is the real cost.
Primary sources
Checked against these public pages. Official sources define confirmed features and status; community sources are labelled as such and used for game data that the developer does not publish directly.