Who is (in your opinion) the best Villain OOTS has faced so far?

[Fyraltari]

Hel, Kubota, Samantha, Adult Black Dragon, Vampire Durkon, probably more I cant think of at the moment.

Bozzok, the Archfiends, Malack and the vampire Exarch come to mind.

I'll give you I forgot Kubota and Samantha.

Would Vampire Durkon be considered a villian though, or would Hel be the primary protagonist of that adventure?

Durkon* had his own agenda (kill Roy and make the dwarves pay) beyond Hel's was the main antagonist to be defeated gfor a significant portion of the book, so yes.

Edit: Also I should probably answer the question: For now my vote would be Durkon* he was clever, by far the most closely linked to a member of the Order and his defeat and whole concept was excellent and very well executed.

However, Redcloak and Xykon aren't far behind and their story isn't over yet so I am liable to change my mind.

Also, are we counting side-books villains?