Overman-Anu was the greatest Champion of the Valley of Voe.
He once climbed the spiral staircase in Pyramid Mountain and fought the Gargoyles of the Land of Naught for nine days before escaping and returning home. Afterward he could not be induced the describe them, though he did say that the creatures shuddered at his battle cry.
In his time he killed eleven bears, though he eventually was killed and eaten by a bear. (Dorothy and the Wizard in Oz)