Sand Wurm

Description
Something like the Sand Worms of Arrakis (Dune, by Frank Herbert). They stay hidden in the sand and pop up under you using a knockdown Attack. Sand Wurms are huge creatures that are extremely well armored, have some kind of natural regeneration and take a long time to kill. They are called Crystal Wurms in the Prima Strategy Guide.

Location
There are 2 in Prophet's Path. One is North of Heroes' Audience, the other is East of Heroes' Audience, near the portal to Vulture Drifts.

There are 2 in Vulture Drifts. One is in the Southern area, the other on the East side of the map between the teleporter and the portal to The Arid Sea.

There are 2 in The Arid Sea. One is in the North, just directly North of the West dune of the pair of inaccessible dunes. The second is far South, directly east of the portal to Vulture Drifts and South of the Southwest set of inaccessible dunes.

Skills Used
None