When I install the Conquest Reforged mod blocks lose texture and turn grey when mining. Also when it rains there is a strange fog and a lot of blur.
Other mods are only embeddium and oculus.

Thaks, but how can i fix grey blocks?

ive seen this before. conquest reforged doesnt allow the rain texture to reach zero alpha, so the bloomy rain effect thinks its a big raindrop. so essentially all the rain planes that the texture scrolls on become a massive raindrop in every direction.

the only things to do are
A: turn off bloomy fog shader settings -> fog settings -> set bloomy fog to zero
B: delete the raindrop texture out of the conquest reforged textures

that the block breaking effect of conquest. i dont know what bliss version youre using as the GUI scale cut that off, but im assuming its v2.0.4. the in-development version reworked how the block breaking effect is blended, and works closer to vanilla now, and should look way better