Clair Obscur: Expedition 33 takes players on a heart-wrenching journey filled with loss, friendship, and survival as they uncover the secrets of the Continent in their fight against the Paintress. Alongside the main quest, you'll also find plenty of optional side quests that offer unique rewards to help you get stronger.

The Demineur quest is one such early-game side activity that you can find while exploring Flying Waters, but since Clair Obscur: Expedition 33 doesn't provide objective markers or maps, it's easy to miss if you aren't checking every corner. For those running into said problem, here's a detailed rundown on how to start and complete the Demineur quest, along with the consequences of each choice.

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How to Start the Demineur Side Quest in Clair Obscur: Expedition 33

To begin the Demineur quest, you need to progress the story until you reach the Flying Waters region. After reuniting with Maelle and reaching the Noco's Hut rest point, move forward until you arrive at a large open section. Instead of continuing straight, take the path to the right.

At the end of the path, you'll spot a circular opening to your right. Head through it to find a white Demineur NPC. Unlike the hostile Demineur enemies you've encountered, this one remains passive, and interacting with it presents three options:

  • Examine
  • Attack
  • Let's Leave It
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Choose "Examine" to note that the Demineur is missing the Underwater Mine that others of its kind carry. Your goal now is to find and return an Intact Mine to complete the quest.

If you choose to attack instead, you'll initiate a boss battle. Defeating the Demineur this way gives you 3x Colour of Lumina and 1x Chroma Catalyst but locks you out of the unique weapon reward.

How to Find the Intact Mine in Clair Obscur: Expedition 33

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Finding the Intact Mine is pretty straightforward. After your initial interaction with the Demineur NPC, you'll notice several platforms nearby. Jump across them to reach a clearing. From there, look south to spot a faint purple glow.

Head toward the glow by jumping onto a rock formation on the right. Follow the path, and after two more jumps, you'll reach an item. This is the Intact Mine.

If you happen to fall, a climbable wall nearby lets you return to the area quickly.

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With the Intact Mine in hand, return to the Demineur and turn it in. You'll receive the Level 3 Deminerim weapon for Lune as a reward. At this point, you can still choose to attack the NPC to trigger the optional boss battle and earn additional loot.

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What Happens When You Attack the Demineur in Clair Obscur: Expedition 33?

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If you attack the Demineur, the quest shifts into a boss encounter.

If you previously completed the quest and delivered the Intact Mine, you can now target the Underwater Mine in the NPC's hand to deal massive damage at the start of the fight.

This version of the Demineur is tankier and deals more damage than the usual enemies but only uses two main attacks:

  • A mine swing with a long animation window that is easy to parry or dodge. If you destroy the Underwater Mine, this attack is removed from its move set.
  • A thunder attack that targets a single party member. Listen for the pitch shift in the sound cue to time your dodge perfectly.

The Demineur is weak to Electricity, so plan your strategy accordingly.

Completing the Demineur quest rewards you with 3x Colour of Lumina and 1x Chroma Catalyst.

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Clair Obscur: Expedition 33
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Turn-Based RPG
JRPG
Fantasy
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Systems
PlayStation-1 Xbox-1 PC-1
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Top Critic Avg: 92 /100 Critics Rec: 97%
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Released
April 24, 2025
ESRB
Mature 17+ / Blood and Gore, Strong Language, Suggestive Themes, Violence
Developer(s)
Sandfall Interactive
Publisher(s)
Kepler Interactive
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WHERE TO PLAY

SUBSCRIPTION
DIGITAL
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Engine
Unreal Engine 5
Genre(s)
Turn-Based RPG, JRPG, Fantasy