In the "Ekeyakee" quest given by Segra Darkthorn in the CrossRoads, go
northeast to Grol'dom farm. Travel to the east side of the mountain, where you
will find the bones of a Giant Kodo near a tree. Stand next to the head and blow
the horn. Ekeyakee will appear, unless someone just killed him a moment ago. He
will be standing next to the tail if done correctly, and is a level 16 White Lion.
Remember that this is a quest, and if you kill him you cannot try again unless you
get a friend to blow the horn and let you tame it. If this happens, he loses the
horn. You can get a new one from Segra by abandoning the quest and getting it
back from her.