King of the Holt Trolls. Outraged and suspicious when Cutter and his Wolfriders invaded his throne room, even going so far as to strike Skywise as he investigated a great lodestone, he turned into a quivering ravvit when Cutter approached him with NewMoon in hand. Luckely for Greymung, Cutter was only swinging to chip off a piece of the lodestone for Skywise. Greymung got the better of the Wolfriders, however, (or so he thought) by persuading them into traveling down the tunnel of light - therby tricking them into crossing the burning waste.
Greymung was a fine figure of a troll in his younger days. He led a revolt against Guttlekraw, driving him back to the frozen mountains and taking the crown. His later years saw him fat and lazy and without the respect of his subjects. Years later Greymung was overthrown by Guttlekraw and killed by the Trolls of the Great Cold, who did not waste meat.