The Book of Fel Names sends the player in the search of a magic book that is a source of Varedis' power.
Blackheart is the second boss in the Shadow Labyrinth.
I sympathize with your intentions of stopping Varedis and his followers, but you won't stand a chance against him. That is, unless you find the artifact that gave him his power.
The Book of Fel Names is rumored to be in the possession of Blackheart the Inciter inside the Shadow Labyrinth in Auchindoun. Obtaining it will be your only hope against Varedis.
Have you obtained the book, <name>?
I was able to sense the book's power from yards away. The temptation to keep it is... very strong.
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Altruis the Sufferer says: This book would give me unlimited power over my enemies... I would become... unstoppable!
Altruis the Sufferer says: No... you must take this from me, <name>! I feel its dark power swaying my will already! Use it to destroy Varedis.