Fix Fatal Error or LowLevelFatalError When Launching Clair Obscur: Expedition 33

Crashes labeled “Fatal Error” or “LowLevelFatalError” in Clair Obscur: Expedition 33 often trace back to graphics driver issues, corrupted game files, or configuration conflicts in Unreal Engine. These errors can prevent the game from launching, cause sudden shutdowns during play, or trigger pop-up crash messages. Addressing the most common causes first maximizes your chances of getting back into the game quickly.

Update Graphics Drivers

Outdated or incompatible graphics drivers frequently cause Unreal Engine games like Clair Obscur: Expedition 33 to crash at launch or display fatal errors. Driver updates often resolve compatibility problems introduced by new game patches or Windows updates.

Identify your graphics card manufacturer (NVIDIA, AMD, or Intel). For NVIDIA, open GeForce Experience; for AMD, use AMD Adrenalin; for Intel, use Intel Arc Control.

Download and install the latest driver version directly from the manufacturer’s website or through the respective software.

Restart your computer after installation to apply the new drivers.

Updated drivers improve stability, reduce crash frequency, and may resolve graphical glitches or performance drops.

Verify Game Files

Corrupted or missing game files can result in startup failures or random crashes. Verifying the integrity of game files through your launcher will scan for issues and automatically repair or redownload problematic files.

Open your game launcher (Steam, Epic, or Xbox PC app).

Locate Clair Obscur: Expedition 33 in your library. For Steam, right-click the game, select Properties, navigate to Installed Files, and click Verify integrity of game files. For Epic, click the three dots next to the game and select Verify.

Wait for the process to complete, then restart the game.

This process ensures all game files are intact and up to date, which can resolve many error messages and crash scenarios.

Disable Overlays

Overlays from Steam, Discord, NVIDIA, or other software may conflict with Unreal Engine games, causing crashes or preventing the game from launching. Disabling these overlays removes a frequent source of interference.

For Steam, go to Settings > In-Game and uncheck Enable the Steam Overlay while in-game.

For Discord, open User Settings > Registered Games, find Clair Obscur: Expedition 33, and disable the overlay.

For NVIDIA GeForce Experience or AMD Adrenalin, disable in-game overlays from their respective settings menus.

Disabling overlays reduces the risk of software conflicts that can trigger Unreal Engine fatal errors.

Force DirectX 11 Mode

Clair Obscur: Expedition 33 defaults to DirectX 12, but some systems or drivers handle DirectX 11 more reliably. Forcing DirectX 11 can bypass crashes related to graphics API incompatibility or unstable hardware support.

In Steam, right-click the game, select Properties, and locate the Launch Options field.

Enter -dx11 (including the dash) in the field.

Close the properties window and launch the game.

This change instructs the game to use DirectX 11, which can improve stability on older hardware or with certain driver versions. If you notice reduced performance, you can remove the -dx11 flag to revert to DirectX 12.

Delete or Rename D3D12 Files

Some crash cases are linked to problematic D3D12 (DirectX 12) files in the game directory. Removing these files forces the game to use DirectX 11, potentially bypassing the error. Always back up files before deleting.

Navigate to the game’s installation directory. For Steam, the path is typically C:\Program Files (x86)\Steam\steamapps\common\Expedition 33\Sandfall\Binaries\Win64.

Locate the D3D12.dll file. Copy it to a backup folder, then delete it from the Win64 directory.

Restart your PC and launch the game.

If this resolves the fatal error, the issue was likely with DirectX 12 compatibility on your system.

Run as Administrator

Insufficient permissions can block the game from accessing critical system resources, resulting in crashes or fatal errors. Running as administrator grants the game the necessary permissions.

Locate the main executable file (ClairObscurExpedition33-Win64-Shipping.exe) in the game’s installation folder.

Right-click the executable and select Properties. Go to the Compatibility tab.

Check Run this program as an administrator and click Apply, then OK.

Launching the game with administrator rights can resolve permission-based crashes and improve game stability.

Install Latest Game Patch

Developers regularly release patches to address known bugs and optimize game performance. Ensuring your game is fully updated can resolve persistent fatal errors that were fixed in recent updates.

In Steam, right-click the game, select Properties, then Updates, and confirm Always keep this game updated is selected.

For Epic or Game Pass, check for updates through the launcher interface.

Restart the launcher and allow any pending updates to install before launching the game.

Game patches address crash bugs, improve compatibility, and may introduce optimizations for new hardware or operating systems.

Additional Methods

Set the game to high-performance mode in Windows graphics settings to prioritize resource allocation.
Close unnecessary background programs with Ctrl + Shift + Esc to free up RAM and CPU for the game.
Lower in-game graphics settings if you have less than 8GB VRAM to reduce memory pressure.
Check that your PC meets minimum system requirements for the game.
If crashes persist, reinstall the game to a different drive, preferably an SSD.
Reset network settings by running netsh winsock reset in an administrator Command Prompt if fatal errors occur at startup due to connectivity issues.

Applying these fixes restores stable gameplay and allows you to enjoy Clair Obscur: Expedition 33 without disruptive fatal errors. If the issue continues, report bugs to the developers for further assistance and future updates.