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Great Worm cavern, the traditional ancestor mound of the Great Worm tribe, was said to reside at the base of a mountain in the Spine of the World range, part of a vast underground complex. Given great reference by the tribes through the lineage of Uthgar's still living son, Elrem the Wise. Little is known of the inside of the caves but stories abound of a large altar depicting stylised represntations of a great spiralling winged snake.
The adventurer Athelyare spoke tales that the caves connection with other parts of the Underdark such as lost Gauntlgrym.