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The ettin are a race that seems to be some kind of beast resembling a cross between a giant and an ogre.
Ettin live in Silverpine Forest and mountains around Gilneas and Redridge. One of these creatures came down looking for a snack, but was stopped by the worgen adventurers. Another of these creatures was subdued by the Forsaken. Yet another of these creatures wanders the vicinity of Baradin Hold in Tol Barad and harries any Alliance or Horde forces that attempt to lay claim to the area.
Brann Bronzebeard says that enough fossils point to theorize them evolving from ogres, but he suspects there might be a "missing link". Any fossil evidence was likely lost when Draenor was torn apart.