Etins, Rises, Thurses and Trolls are descended from Ymir, including Odin's mother Bestla. The word Etin, is interchangeable with Jotun. They are often referred to as Frost Giants or Jotnar, the plural of Jotun. These creatures are the wild forces of nature and because of this are considered a destructive and dangerous foe to humans and the Gods and Goddesses. However, there are exceptions. Skadhi who is married to Njord, and Mimir, uncle to Odin, are both etins who have shown loyalty and cooperation towards the Aesir and Vanir.