This seems to be an issue on your side, so afaik there's nothing to fix in the game.

Try the following already:

- restart your pc (yes, sounds like a stupid suggestion, but we had people before reporting weird issues when their pc had been running for weeks without having been shut down)

- verify the game files to make sure nothing is corrupt: right click Medieval Dynasty in the list of games in your Steam library, pick 'installed files' and then 'verify integrity of game files'

- update graphics card drivers

- change to DX11 ingame: settings - graphics - rendering mode - DX11 (Don't forget to accept changes at the bottom)

- try changing the windowed mode ingame to fullscreen windowed: <escape> - settings - graphics - Window mode - Windowed fullscreen

- limit your fps ingame to 60 : settings - graphics - Frame rate limit
(make sure to accept changes at the bottom)

- Go to device manager in Windows and check under display drivers if you have a second GPU listed there (an onboard one on your motherboard). If you do, please right click and 'disable device' and afterwards restart your pc.

- make sure that your antivirus/firewall isn't blocking any game files


Do you still have the crashes after trying this?