Vanilla mountain LOD is a crime against geology. Majestic Mountains replaces the meshes and provides flawless, jagged LOD files. When paired with DynDOLOD, you will see mountain ranges that look hand-sculpted, even from Helgen.
Ground covers like tundra moss and dead shrubs need LOD too. These mods provide billboards so that distant ground clutter looks like actual plants, not green smudges. skyrim se lod mod