Fields of Mistria Mines Guide: Floors, Biomes & Seals

The Mines have five biome ranges: Upper Mines 1-20, Tide Caverns 21-40, Deep Earth 41-60, Lava Caves 61-80, and Ancient Ruins 81-100. Water, Earth, Fire, Ruins, and Final Seals control deeper access.

Know the five biome ranges

The five major areas cover 20 floors each. Regular resource floors run through 1-19, 21-39, 41-59, 61-79, and 81-99; the final floor of each range is used for progression rather than a normal resource loop.

Why seals block deeper floors

You cannot simply descend by finding enough ladders. Story seals connect the Mines to the Water, Earth, Fire, Ruins, and Final Seal quest stages, so a blocked gate means the next progression step is outside the current floor run.

The Ruins Seal on Floor 80 opens the Ancient Ruins. The Find the Magic Key route at Floor 90 continues the late Mines progression and leads to the Priestess Quarters and Dragon Forge.

Choose a resource goal

Use the biome range to decide whether the run is for ore, gems, museum finds, crafting materials, or story progress. Keeping one clear goal makes stamina and inventory space easier to manage.

Prepare for a deeper run

Bring food because stamina can be a harder limit than the clock during deeper runs. Check your current seal objective before entering so you do not spend the day farming a floor that cannot advance the story.