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 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.