Lore of the Witch World — Andre Norton

The Witch World is never explored: the smallest valley holds strange happenings and a past which reaches into things stranger still. The traveler finds the unexpected, the ancient, the bizarre at every turn. Nature is powerful here and those who open their hearts to it and to living things find themselves capable of marvels and involved in an old, old warfare. One meets old friends here, and hears of them; finds remnants of eldritch powers and visitants; finds--if one looks ancient truths about courage and honesty and duty that involve the highborn and the ordinary, the young and the old, humans and the four-footed kind all in one fabric of magic and mystery.