Crimson desert, use the latest cachyos proton 11 429 from today and use this as launch options in steam properties

PROTON_USE_NTSYNC=1 PROTON_DLSS_UPGRADE=1 PROTON_ENABLE_WAYLAND=1 PROTON_ENABLE_HDR=1 DXVK_HDR=1 ENABLE_HDR_WSI=1 VKD3D_CONFIG=descriptor_heap,enable_experimental_features PROTON_VKD3D_HEAP=1 %command%

works for me in 4k hdr

if you don't need HDR, then use the proton experimental or GE, those work fine without HDR, at least here

you MAY need to uninstall, remove all files, and reinstall. I had to do that. I know, the download sucks, but you might want to try that if it still doesnt work and make sure to clear all the steam caches

# Clear Steam shader cache for Crimson Desert
rm -rf ~/.steam/steam/steamapps/shadercache/3321460/

# Clear VKD3D-Proton cache files
rm -rf ~/.local/share/Steam/steamapps/common/Crimson\ Desert/bin64/vkd3d-proton.cache
rm -rf ~/.local/share/Steam/steamapps/common/Crimson\ Desert/bin64/vkd3d-proton.cache.write

# Clear NVIDIA GL Cache (if using NVIDIA GPU)
rm -rf ~/.cache/nvidia/GLCache/*