In Clair Obscur: Expedition 33, Chroma Catalysts are special upgrade materials used at your camp with the NPC called the Curator to push weapons to specific level milestones, not items you “use” directly from the inventory.

What Chroma Catalysts Are

Chroma Catalysts are a weapon upgrade resource that unlock higher level caps and extra passive power spikes for your weapons.

They sit in your inventory doing nothing until you unlock the Curator’s upgrade services during the main story.

When You Can Start Using Them

You can’t use Chroma Catalysts early on, even though you can pick them up in the Continent and see them in your bag.

The ability to spend them unlocks later in Act 1 after you reach Flying Waters and progress the story to the manor section where you encounter Maelle and the Curator.

Once you’ve met and fought the Curator at The Manor and then advanced the story, he relocates to your camp and opens his upgrade options there.

Step‑by‑Step: How To Use Chroma Catalyst

Follow this loop once the Curator is at camp:

  1. Go to the overworld camp and find the Curator’s spot (a cave to the right of the main campfire area).
  1. Talk to him and open the upgrade menu where you can:
    • Upgrade expedition resources (Colour of Lumina, potion bottle upgrades with Tint shards).
 * Upgrade weapons using your Chroma Catalysts.
  1. Select the weapon you want to improve; if it’s at the correct threshold and you have the required Chroma Catalyst type, you’ll see the option to raise its level cap.
  1. Confirm the upgrade to consume the Catalyst and unlock the new maximum level, then spend regular upgrade materials to fill in levels up to that cap.

A simple story‑style example: you finish the manor section, defeat the Curator, later find him at camp, and finally that “mystery” Chroma Catalyst you looted hours ago turns into a button in his menu letting you push your favorite weapon past its early cap.

All Chroma Catalyst Types and What They Do

Here’s a quick HTML table of the different catalyst tiers and their main use:

html

<table>
  <thead>
    <tr>
      <th>Chroma Catalyst type</th>
      <th>What it lets your weapon reach</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Chroma Catalyst</td>
      <td>Upgrades weapons up to Level 3. [web:1][web:3][web:9]</td>
    </tr>
    <tr>
      <td>Polished Chroma Catalyst</td>
      <td>Upgrades weapons up to around Level 9. [web:3]</td>
    </tr>
    <tr>
      <td>Resplendent Chroma Catalyst</td>
      <td>Upgrades weapons up to around Level 19. [web:3][web:7]</td>
    </tr>
    <tr>
      <td>Grandiose Chroma Catalyst</td>
      <td>Upgrades weapons up to around Level 32. [web:3][web:6]</td>
    </tr>
    <tr>
      <td>Perfect Chroma Catalyst</td>
      <td>Upgrades weapons to the final Level 33 cap. [web:3][web:5]</td>
    </tr>
  </tbody>
</table>

Each tier is rarer and generally found later in the game or from more demanding content, and you’ll need multiple pieces of a given tier to carry a single weapon all the way up through its milestone levels.

Tips, Farming, and Forum‑Style Takeaways

Players on guides and forums tend to agree on a few practical points:

  • Don’t stress early: It’s normal that your first Chroma Catalyst just sits unused until the Curator is unlocked.
  • Focus on a core weapon or two so you don’t spread high‑tier catalysts too thin, especially Grandiose and Perfect.
  • Later in the game, dedicated farming routes exist for higher‑tier catalysts, letting you grind Grandiose and Perfect Chroma Catalysts via fast boss or elite enemy loops.

Many players describe the moment the Curator opens his shop as the point where their build “comes online,” because those catalysts suddenly convert into big damage spikes and new passives.

TL;DR: You don’t equip or click Chroma Catalysts directly; you progress the story until the Curator is at camp, talk to him, open his upgrade menu, then spend the appropriate Chroma Catalyst tier there to raise your weapon’s level cap (3, 9, 19, 32, 33 depending on the type).

Information gathered from public forums or data available on the internet and portrayed here.