The official GemStone IV encyclopedia.
Massive and thick, with broad shoulders but no apparent head, the earth elemental appears to be a composite of the earth itself. A large, craggy maw in the middle of the elemental's chest appears to be the creature's mouth, and the earth elemental's huge feet and giant-sized fists look like they would pulverize flesh without much effort at all.
Unlike other creatures in the Confluence, the huge earth elemental has a humanoid body and can suffer critical effects like knockdown. If still standing when it dies, there is a chance it will topple onto characters and crush them.
Huge earth elementals have the equivalent of full plate (AsG 20) against physical and bolt attacks.
They can perform a maneuver that freezes a target in place:
A huge earth elemental reaches out to touch you. The touch is cold and sickening and suddenly you feel strange. Unable to do much, you begin to become rigid! Soon you cannot move!