Steddings
Ogier live in the stedding, small enclaves of exceptional botanical growth. After the Breaking of the World, the Ogier were forced out of their stedding and wandered the land for many years, seeking new ones. As a result, the entire race was instilled with the Longing; any Ogier who venture away from the stedding for too long will die. It is implied that five years out of a stedding is an extreme absence for an ogier to make; while they can still live at ten years away, any period of time between will begin to affect the mental and physical health to varying degrees. An Ogier who has been long from the stedding might be required to take several days' rest every now and then to recuperate and delay the Longing. The stedding also have the unique property of insulating anyone inside them from the One Power, and during the Breaking, some male Aes Sedai sought refuge from the Dark One's taint on saidin in the stedding. Historians argue about whether this prolonged the Breaking or diluted it (not coincidentally, those who hold the former view tend to be of the Red Ajah). Also there is no reflection of stedding in the World of Dreams, and a Dreamwalker cannot enter them in dreams.
Read more about this topic: Ogier (Wheel Of Time)