Killing a Calpheon Shadow Guard results in a high chance of Corrupt Crystal drops; similarly, file corruption may be a result of high system stress. How and why this happens is a long technical adventure only for the brave ones out there, but there is an easy solution in case you are affected.
Repair via the game Launcher
- First, start your Black Desert Online Launcher and click on the cogwheel icon on the top-right corner of the window.
- Press on the Click To Start button, right next to the "Repair Mode".
- Choose the Yes option.
Note that while this may look like the Launcher is redownloading a massive amount of data, only damaged and missing files from your installation folder will be downloaded. You can confirm that this is the case by the Checking Files text located on the bottom-left of the Launcher window.
Forcing a file repair
In case the repair button is not clickable or in a gray state, you can force the Launcher to go into repair mode by deleting the version.dat file found on your game installation folder.
What about Steam?
If you are using the Steam platform, you can verify the integrity of your game files by using Steam's built-in file checking function, as described here.