Lyric discussion by callistorising 

Cover art for Unholy Warcry lyrics by Rhapsody of Fire

This is pretty simple, in that Dargor has been chosen to venture into the caves of Dar-Kunor to find and destroy Nekron's seventh black book. It also seems to suggest that Dargor used to be evil, and it is later revealed that Dargor is half-demon. But he became good. The only part I don't get is this:

He is Kron, Kron's disciple He is sworn to return To avenge the lost divine wars

Who is "he"? Who is Kron's disciple? Is it Venkur, Dargor's father? If so that would make a heck of a lot of sense.