If you find yourself running DOFUS 3 on Linux, you may had to deal with your desktop environnment or your display server. In my case, after moving to Gentoo I could not run DOFUS again without forcing SDL to render for X11

Fixing this took the following form as I am running the .AppImage version of the luncher.

$ export SDL_VIDEODRIVER=x11
$ export GDK_BACKEND=wayland
$ /opt/Dofus-3.0-Setup-x86_64.AppImage