Which combined artifact is the best?

The King of the Undead's cloak is a good item, but remember that it's only good for Necropolis. Why would Humans or other factions need it?

It can also be useful for Humans! Once, when I was playing as Haven, I took Adele the Scholar, and she gave me the main Necromancy skill. Then I got the King of the Undead's cloak, and that was it... Victory was mine! It's a rare occurrence, but still...