The official GemStone IV encyclopedia.
Tall but sleek, the size of the thunder troll belies its quickness. The thunder troll moves about surrounded by a raging tempest. An upturned lip, protruding jaw and sunken, orange eyes impart an air of arrogance to this foul, rubbery creature. Given to sudden fits of uncontrollable rage, a thunder troll has been known to spring from the forest and tear a seasoned warrior in half before the warrior can even cry out, then, surprisingly, turn and dart away, distracted, leaving small children unharmed.
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Thunder trolls may knock adventurers down when they rush into the room.
They also have the ability to reflect Cone of Elements (518) lightning variation and potentially other lightning-based attacks upon their caster.