Hi there.
There's seems to be a driver issue related to Spellforce 3. There are multiple bug reports in the steam forum from users with 5700 XT graphic cards:
5700XT || DXGI_Error_Device_Hung || Spellforce 3 Crashes || Soul Harvest Runs| Needs HOTFIX :: Spell...
DirectX errors at start of campaing :: SpellForce 3 Bug Reports
DirectX Error (DXGI_ERROR_DEVICE_RESET) [Device lost / hung] :: SpellForce 3 Bug Reports
Fatal DirectX Error :: SpellForce 3 Bug Reports
I myself also run into this issue. I can't play the game. It always says DX device hung / lost. You can reproduce this problem with the game installed, starting the campaign. You only need a 5700 XT graphics card:
SpellForce III - CTD Kampagne - YouTube
After the Youtube video there are multiple popups with the error messages and the game screen is black:
(DXGI_ERROR_DEVICE_HUNG) [Device lost / hung]
(DXGI_ERROR_DEVICE_REMOVED) [Failed to create vertex buffer]
My system:
OS: Windows 10 Pro 64-bit (10.0, Build 18362)
CPU: AMD Ryzen 7 3700X 8-Core Processor
MB: ASUS PRIME X470-PRO
RAM: 32 GB G.Skill F4-3200C16-16GTZR
GPU: AMD Radeon RX 5700 XT - Powercolor Red Devil
Please fix this bug with an driver update. I already tested multiple driver versions and graphic settings.
Best regards.