The Other Gods – H. Lovecraft

Barzai the Wise, a high priest and prophet greatly learned in the lore of the "gods of earth", or Great Ones, attempts to scale the mountain of Hatheg-Kla in order to look upon their faces, accompanied by his young disciple Atal. Upon reaching the peak, Barzai at first seems overjoyed until he finds that the "gods of the earth" are not there alone, but rather are overseen by the "other gods, the gods of the outer hells that guard the feeble gods of earth!" Atal flees and Barzai is never seen again.