Find The Beginnings of the Undead Threat, and return it to Parqual Fintallas in Undercity.
I will tell you what you must seek, and I will even ask you my question, but not because you wish to prove yourself. Knowledge is far more important than strength. Even as others seem to pass you by in ability, your knowledge of the world will be more valuable.
Go to the Monastery in the north of Tirisfal Glades. In the library there, a book called Beginnings of the Undead Threat resides. It was used by the now-corrupt paladins there to train them to fight my kind.
Bring it to me.