The Wizard's Sword - Nine Worlds of Mirrortac, #1

Giant serpents, bat-winged people who live in trees, underground dwellers, a six-headed monster, a pyramid on a island, and a sorceror and sorceress bent on destruction. These are some of the dangerous and the odd that the humble erfin Mirrortac must encounter on his mission to save all the worlds from an encroaching evil that has already begun to take hold. It is an epic adventure that takes Mirrortac beyond what was thought as the end of the earth - the Netherworld - through many incredible places inhabited by varied races of beings, each with their own world-view.
And it all started with a magic sword found in the woods of the erfin homeland Eol.