https://bugs.winehq.org/show_bug.cgi?id=46416
--- Comment #17 from Sveinar Søpler cybermax@dexter.no --- @themainliner You did not write that you actually upgraded dxvk to current release 1.0.1 that should have a fix for WoW 8.1.5.
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Bug fixes and Improvements
Fixed memory allocation failures on Intel Bay Trail (#947) Fixed regression that broke DXGI gamma control (#937) Devil May Cry 5: Enabled d3d11.relaxedBarriers option by default to improve performance Star Wars Battlefront (2015): Report Nvidia GPUs correctly to fix driver version error (#968) Resident Evil 2 and Devil May Cry 5: Work around dark rendering issue on Nvidia GPUs (#956) World of Warcraft: Fixed GPU hangs on Nvidia GPUs since game patch 8.1.5 (#964) -- Just tested with DXVK 1.0.1 now, and had no problems.
If you do not have vkd3d installed/compiled, WoW MIGHT actually try to start up in D3D12 mode unless you either launch it via script and -d3d11 option, or set this option in the battle.net launcher. (8.1.5 resets graphics options to default, and since 8.1 D3D12 is default chosen).