Ahh, I've been searching for years but to no avail... But I shall not give up my search, I can't give up.
Our young hero, Fannakk, Crusader of the Zakarum faith, journeys far and wide to find and destroy the corruption that has infested the Zakarum.
Our hero wandered upon the small town of New Tristram, built onto the ruins of Old Tristram which was destroyed by the Mad King Leoric when Diablo's influence drove him mad. It seems that a bright fiery object that people are calling the "Falling Star" fell on top of the old Cathedral, and ever since then the dead have been rising and killing villagers
Maybe this object has something to do with the filth that has infested the Zakarum?
So you're the one who corrupted the Zakarum!
After his long search, our young hero found the one he was looking for, a sorcerer by the name of Carnus. He used his magic to infest the Zakarum so he could have his own army and be the strongest being in the universe.
The Sorcerer shrunk down to the size of a cat to avoid Fannakk's fury as his werewolf pet rose to attack Fannakk.
In the end Fannakk struck down the werewolf and captured Carnus with an amulet that prevents the wearer from using magic and can only be taken off by the one who put it on.
Your reign of terror is over Carnus!
In the end Fannakk took Carnus to his master to tell him that he finished his crusade by finding the source of the infestation of the Zakarum. And was awarded with a new set of armour. And donned knight-captain of the Crusaders.