Hwelp wtf is this guys? It appears only at low angle and with rough translucent material
What you are facing is most likely the terminator effect. It happens mostly when there is only 1 light source that hits some of the faces at a grazing angle:
To get rid of it, I hope the solution works for your project:
Either increase the subdivisions, this way the surface is smoother (and the faces are smaller, so it's much less visible) Or add another light to complement the one you have. I used a Nishita Sky with emission 0.05 and set the subdivision to 3 I can't see it anymore.