The greatest being the world has ever known. All things in existence exist because hes wills them to. The Chieftan is second to no one and exists on an ethereal plane in seperate reality inaccessible to humans. The Chieftan employs the use of shamans, similarly to the way god employs the use of angels, to access the common folk, for they are naturally unable to comprehend or withstand the staggering magnitude of his being.
(pasquals wager: states) that you can only beilieve in the Chieftan, for if you did not, then you would negate your existance by removing that which created you from reality, ultimately resulting in your own inexistance in this world, thereby negating the possibility that you did not believe in the Chieftan, for you would not exist. This is how the Chieftan's omnipotence is asserted and proven. (if such a thing as proof was ever needed)