You can bend the will of nature within 5 miles, shaping the land and creatures. By spending a period longer than 3 weeks concentrating on the natural land within five miles, which includes studying the creatures and plants, meditating watching weather patterns etc, you can change natures will itself. You can do a variety of things, talk to your dm about what your allowed to do. You can change weather patterns. Making it snow or halting all precipation. You can change the animals in the area habits and instincts. You can move and form the earth and stone beneath into new shapes. You can grow forests or have them die. However you cannot change anything that has been crafted by humanoids or things that are unnatural, such as a city or tower. You can change whats around it but not the settlement itself.