Well I made my mod to fit my purpose. Unfortunately, I dont know how to make it work with other peoples mods. There is a mod that alters the grass.. I have removed the grass from the vanilla state. But I dont know how to remove the grass from this mod that add grass all over the world. I made this mod for the sole purpose of playing Tundra defense. Right now it looks like this. The navmesh isn't properly done but it works for now.