Realistic and classic atmosphere.Better sky colors and double clouds,3 modes of sky:3D clouds, 2D clouds, OFF clouds.Unique clouds,Improved sunny and rainy weather,Better water,Better fog of nether biomes,Improve end sky and fog color. (Updated to version 2.1.0)
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Changelog
everything that was radically changed was mentioned earlier in the description; everything else was either untouched or the changes were not too large-scale to be mentioned