Legend has it that if a great warrior wished to unite the tribes of Eodon against a common foe, they would have to construct a Giant drum on the top of Drum Hill. After convincing every chief to join the hero in battle, the hero would then beat the drum to summon the tribes throughout the land to fight for a common cause.
In Savage Empire, the Avatar did exactly that. After learning the rhythm, the Avatar took several hides to Tuomaxx, who lived at Drum Hill, to create a new drum. That done, the Avatar rallied all the tribes after gaining the support of all of them, to strike against the Myrmidex.