@Marfey @gamingonlinux I don't recall if you said you were already using the game on Lutris, and this may be irrelevant; but try double checking you have the appropriate drivers for your system. These two links should give you the correct packages for your OS:

https://github.com/lutris/docs/blob/master/InstallingDrivers.md

https://github.com/lutris/docs/blob/master/Battle.Net.md