https://wccftech.com/dark-souls-3-next-gen-fake-ray-tracing-reshade/

A new ReShade Preset has been released recently for Dark Souls 3, introducing massive atmosphere improvements with the introduction of global illumination and improved ambient occlusion.

The Next-Gen Dark Souls 3 Fake Ray Tracing Preset improves the game's atmosphere quite a bit, making the game a little darker but introducing some lighting improvements that make everything look much better. It is not real ray tracing, but it achieves similar results. The preset also has minimal impact on performance, as confirmed by its creator.