Fields of Mistria Mines Guide: All Biomes, Seals and Floor 100
Unlock the Mines, follow all five biomes, prepare every seal offering, and finish the Floor 90 Magic Key and Floor 100 Final Seal quests.
Updated Game version 1.0.3
Mines quick facts
Location
Northern part of The Narrows
Unlock
Stone Town Rank + Unlocking the Mines
Main route
Floors 1–100 with special checkpoints
Biomes
Five
Elevator
Every fifth floor already reached
Questline complete
Version 0.15
How to unlock the Mines
Reach Stone Town Rank, then complete the active Unlocking the Mines quest. Reaching the entrance in The Narrows is not enough by itself. If the doors remain closed, check your town rank and quest log before looking for a missing tool or hidden switch.
All five Mines biomes and floors
All five Mines biomes
Biome
Ordinary floors
Checkpoint
Ore
Gem
Progress block
Upper Mines
1–19
20
Copper
Ruby
Water Seal
Tide Caverns
21–39
40
Iron
Sapphire
Earth Seal
Deep Earth
41–59
60
Silver
Emerald
Fire Seal + Sealing Scroll
Lava Caves
61–79
80
Gold
Diamond
Void Mass + Ruins Seal
Ancient Ruins
81–89, 91–99
90 and 100
Mistril
Pink Diamond
Magic Key, then Final Seal
Official v0.13 notes group Floor 80 into the Lava Caves milestone. Ordinary randomized Lava Caves floors are 61–79; Floor 80 is the checkpoint. Ancient Ruins ordinary floors are dark, while Mistril, certain enemies, related equipment, and later Sacred Light can provide visibility.
Progression route and elevator checkpoints
The elevator records every fifth floor reached. On ordinary floors, break rocks and defeat monsters until a ladder appears. Returning to the Ground Floor and re-entering resets those floors. Elevator stops are not all seals: the major objectives are on Floors 20, 40, 60, 80, 90, and 100.
Floor 60 is a two-task checkpoint. Progress The Fire Tablet, then complete Procuring the Sealing Scroll through Balor. Submit Ruby ×10, Sapphire ×10, Emerald ×10, and Silver Ingot ×10, then talk to Balor again to receive the scroll.
Offer it with Faceted Rock Gem, Rockroot, and Emerald at the Fire Seal. This also opens the route tied to the Caldarus guide.
Show Floor 80 Void Mass and Ruins Seal steps
Floor 80: two separate objectives
First create the Void Mass with Void Stone ×5, Void Powder ×5, Void Herb ×5, and Void Pearl ×5. Then break the Ruins Seal with Breath of Flame, Smoke Moth, Firesail Fish, and Obsidian, one of each. The Void materials are not the four direct seal offerings.
Show Floor 90 story steps
Floor 90: how to find the Magic Key
Explore the Priestess Quarters task rooms.
Use Dragon’s Breath to light the Dragon Forge.
Complete the Library and Priestess Tablet objectives.
Offer one Temple Flower and one Marigold.
Plant the Seed of Balance in the Field Room.
Water it until it matures, or use Growth to speed it up.
Harvest the Magic Key and open the locked door.
The available sources disagree on a fixed growth time, so this guide does not promise an exact number of days.
Show Floor 100 story and crafting steps
Floor 100: Dragonsworn Tablet and Final Seal
Inspect the Tablet, reach 8 Hearts with both Juniper and Eiland, and view both 8-heart events. Talk to Juniper, continue the quest, then return to read the Dragonsworn Tablet. The Juniper guide covers her relationship route.
After the quest, craft all four offerings at the Dragon Forge. Every recipe also requires Medium Essence Stone ×1.
Final Seal Dragon-Forged recipes
Offering
Ingredients besides Medium Essence Stone ×1
Dragon-Forged Fang
Monster Fang ×5; Void Stone ×5; Void Herb ×5; Written Root ×1
The completion cutscene ends the day. Finish important daily tasks before offering the last item. Dragon-Forged Core is also used in the later wedding route.
Common Mines progression problems
The Mines are locked: Reach Stone Town Rank and complete Unlocking the Mines.
No ladder appeared: Keep breaking rocks and defeating monsters. Returning to the Ground Floor and re-entering resets ordinary floors.
Stuck on Floor 20 or 40: Verify all four biome-specific offerings; similar-looking items do not substitute.
Stuck on Floor 60: Finish the Sealing Scroll subquest and talk to Balor after depositing its materials.
Void items are not appearing: Follow the active Floor 80 quest chain instead of an old pre-v0.15 endpoint.
The Floor 90 Forge does nothing: Confirm Find The Magic Key is active and use Dragon's Breath.
The Seed of Balance seems missing: Update past the early v0.15 issue addressed by v0.15.2 and v0.15.3.
The Floor 100 quest will not continue: Check that Juniper and Eiland are both at 8 Hearts and both 8-heart events were viewed.
The Final Seal is ready: Complete important daily tasks first because the completion cutscene ends the day.
What changed in the Mines?
v0.13: Lava Caves and the Fire Seal route were added.
v0.15: Ruins progression was added and the complete Mines Questline became finishable.
v1.0.x: Treasure drops, special-room frequency, ladder UI, and several Mines crashes received updates. The official notes reviewed for this page do not add a sixth biome.
Frequently asked questions
How do you unlock the Mines in Fields of Mistria?
Reach Stone Town Rank and complete the active Unlocking the Mines quest.
How many Mines biomes are there?
There are five: Upper Mines, Tide Caverns, Deep Earth, Lava Caves, and Ancient Ruins.
What floors unlock the elevator?
The elevator records every fifth floor reached. The seal and story checkpoints are Floors 20, 40, 60, 80, 90, and 100.
What do you need for the Water Seal on Floor 20?
Bring one Stone Loach, Upper Mines Mushroom, Ruby, and Lantern Moth.
How do you get the Sealing Scroll for Floor 60?
Complete Balor’s Procuring the Sealing Scroll quest, submit ten each of Ruby, Sapphire, Emerald, and Silver Ingot, then talk to Balor.
How do you get past Floor 80?
Create the Void Mass first, then offer Breath of Flame, Smoke Moth, Firesail Fish, and Obsidian at the Ruins Seal.
How do you get the Magic Key on Floor 90?
Activate the Dragon Forge with Dragon’s Breath, complete the task-room objectives, offer Temple Flower and Marigold, then grow the Seed of Balance.
Why is the Floor 100 quest not progressing?
Juniper and Eiland must both be at 8 Hearts, and both 8-heart events must have been viewed before continuing through Juniper.
Does the Final Seal end the day?
Yes. The completion cutscene ends the day, so finish important daily work before submitting the last offering.