The official GemStone IV encyclopedia.
Hunched over and bow-legged, the bog troll bears many resemblances to the frogs that inhabit the bogs along with it. Its skin is a dark yellow mottled with patches of brownish green. Its mouth, wide and thick-lipped, displays rows of misaligned, jagged teeth, and the troll keeps a constant grin, as if its teeth are too large for it to completely close its mouth. Bulbous green eyes sit nearly atop its flat cranium, and sharp claws extend from its oversized, webbed hands and feet.
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You will greatly regret dying near a bog troll in particular areas of the Miasmal Forest, as they will hide your corpse:
A bog troll pushes your corpse deep into the muck and mire until it covers you completely.
which it should go without saying, makes it impossible to be located.
Bog family creatures