Lokmorr the Betrayer
Former right-hand-man to the famed giantslayer Nargrym Steelhand, Lokmorr stabbed his master to death after the latter slew a powerful fire giant. When Lokmorr's betrayal was discovered, he was sentenced to spend all eternity in Nargrym's tomb.
His body twisted and gnarled from spending 639 years underground, Lokmorr now survives by eating all rats and other vermin who wander into Nargrym’s tomb. He brandishes Nargrym’s magic spear in the magic, steel hand that he removed from the giantslayer’s corpse. He wears Nargrym’s shorn beard as a trophy on his belt, and his forehead is marked with the dwarven rune for “murderer”.