The official GemStone IV encyclopedia.
The dust beetle appears to be some sort of giant insect. It looks a little like some misshapen scorpion, but the tail on it is not as long as a scorpion's would be, and it flares like the tail of a lobster rather than ending in a poison sting. The segmented body is wide, supported by six short multi-jointed legs. A dull red chitinous shell covers most of its body, and a broad carapace protects its head. Two massive claws provide the creature with formidable weapons.
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Beetles are puncture resistant rather than puncture immune since being converted to BCS.
Behind The Scenes
Dust beetles were found in Shadow Valley before the shadow mares and other defiant cursed equines returned to defeat the Terrorite demon. It is an allusion to the "beetle civilisation" that is supposed to follow the end of the race of man in "The Shadow out of Time" by H.P. Lovecraft, which is also relevant for the giant fog beetles in The Broken Lands. They are variants of the extra-planar insect raced called Dictics of Rolemaster.