Issue

Error 25: A Critical error has occurred while initiating Direct3D

Solution

1. Select "Diablo II" bottle
2. Open "Run Command"
3. Fill in "Command" with "-w" option in the end

eg. "/Users/$USER/Library/Application Support/CrossOver/Bottles/Diablo II/drive_c/Program Files (x86)/Diablo II/Diablo II.exe" -w

Once you've successfully set it up, you may use "Run with Option" "-w" to start

References

Diablo II (2000) Error 25

How to resolve this error in Diablo II (2000)

Blizzard Support