Tarnum was a Barbarian, and the Barbarians were enslaved by the Wizards. Tarnum led a rebellion and won; he entered the cities of the Wizards, was amazed by their culture, and became a Wizard himself.
After reading their works, Tarnum suddenly realized that he was mortal and that he didn't know what awaited him beyond the threshold. Then, forgetting all his old interests, he lived in fear; and nothing saved him until a preacher from the Knights came. Tarnum accepted their faith and became a Knight.
Together with his new comrades, he went on a campaign against the lords of the underworld and the demons...
Damn, I forgot how to continue in that style, so I'll be brief: he decided to acquire unprecedented power and became a Demon (and by the way, his wife left him, and he grew horns); then he became disillusioned with them and ran away to seek peace with the Elves; then he got tired of sitting in trees, shooting at everyone who passed by, and went to seek thrills with the Necromancers, who love various risky spells; and then, one day, as a result of an unsuccessful magical experiment, he turned into a lizard and has been working as a Beastmaster ever since:D