Here’s how to start and finish the Demineur quest in Clair Obscur: Expedition 33, where to find the Intact Mine, and what happens if you choose to fight instead.
Clair Obscur: Expedition 33 – Demineur Side Quest Guide
Clair Obscur: Expedition 33 is packed with emotional story beats and tough battles, but it also hides some surprisingly meaningful side quests. One of the earliest — and easiest to miss — is the Demineur quest, tucked away in the Flying Waters region.
If you’re not combing every nook and cranny, it’s easy to walk right past it. So here’s a full walkthrough on how to start and finish the quest, plus the consequences for each decision you can make.
️ How to Start the Demineur Quest
To find the quest:
- Progress the story until you reach Flying Waters.
- After reuniting with Maelle and unlocking the Noco’s Hut rest point, keep moving forward until you reach a large open space.
- Instead of going straight, take the right-hand path.
- At the end of that path, look for a circular cave-like opening on your right.
- Inside, you’ll find a white Demineur NPC just standing there.
Unlike the aggressive Demineurs you’ve fought, this one is passive. Interact with it and you’ll get three choices:
- Examine
- Attack
- Let’s Leave It
Choosing Examine will reveal that it’s missing its Underwater Mine — kicking off your objective to find and return it.
How to Find the Intact Mine
From the Demineur’s location, look around and you’ll see some nearby platforms.
Here’s how to reach the Intact Mine:
- Jump across the platforms until you reach a small clearing.
- Look south — you’ll see a faint purple glow in the distance.
- Jump onto the rock formation to the right and follow the path.
- After two more jumps, you’ll reach a glowing item — that’s the Intact Mine.
If you fall, don’t worry — there’s a climbable wall nearby that lets you get back up quickly.
Turn in the Mine – Quest Reward
Bring the Intact Mine back to the Demineur and interact with it again. After the scene, you’ll get:
- Deminerim (Level 3 Weapon for Lune)
At this point, you’ve technically completed the quest — but you still have the option to attack the Demineur and trigger a boss fight for extra loot.
⚔️ What Happens If You Attack the Demineur
If you choose to fight the Demineur — either immediately or after turning in the Mine — it becomes a mini-boss with a couple of interesting mechanics:
Boss Fight Details:
- If you already gave it the Intact Mine, you can target the Underwater Mine during the fight for a big damage spike. This also disables one of its main attacks.
- The Demineur is tougher than your usual enemy — with more health and stronger hits.
Moves to Watch For:
- Mine Swing: A slow, heavy attack. Parry or dodge it — or disable it by destroying the Mine early.
- Thunder Strike: Hits one party member. Listen for a pitch change in the sound cue to time your dodge.
⚡ Weakness: The Demineur is vulnerable to Electricity, so plan your skills and party setup around that.
Boss Fight Rewards:
- 3x Colour of Lumina
- 1x Chroma Catalyst
Which Path Should You Take?
If you’re focused on unlocking Lune’s gear, we recommend turning in the Mine first to get the Deminerim weapon — it’s one of the earlier rare weapon rewards.
But if you want to go full completionist, you can do both: complete the quest, then fight the Demineur anyway for the bonus loot. Just be ready for a tougher version of the enemy.
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- Clair Obscur: Expedition 33 – Sirene’s Dress Guide (How to Enter & All Rewards)
- How to Get the ‘Peace at Last’ Achievement in Clair Obscur: Expedition 33 (Simon Boss Guide)
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