Craster is a Wildling, Ranger on the other side of the wall, which maintains a "friendship" very relative with the Night's Watch. Angry, it is an incestuous polygamist who married each of his daughters. When they give birth to boys, Craster sacrificed his son to White Walkers immediately after birth. It hosts grudgingly shipping Lord Mormont, taunting and insulting members of the Guard. During their return trip, some recruits lose patience and kill.Source:Wikipedia

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