God Rays are enabled by defult but thay're desabled in Low and Very Low settings.

How to Enable:
Open the enbeffect.fx and scroll a bit down to the GOD RAYS section, then find the line named //#define GODRAYS and change it to #define GODRAYS

How to Desable:
Open the enbeffect.fx and scroll a bit down to the GOD RAYS section, then find the line named #define GODRAYS and change it to //#define GODRAYS