Cloak of the Undead King
The Cloak of the Undead King is extremely powerful and useful for Necropolis players and is relatively easy to make.
The Cloak of the Undead King resurrects 30% of the battlefield dead as skeletons. If the hero already has the Necromancy skill the percentages are added to that skill and the hero's proficiency with Necromancy determines what Undead is re-raised.
Basic yields Skeletons. Advanced yields Zombies, and Expert yields Liches.
In order to make the Cloak of the Undead King you need to have three artifacts:
You cannot purchase combination artifacts in Artifact Merchants. Cost is derived from sell price.
It is also important to note that as with all combination artifacts the hero will continue to receive the benefits of the individual artifacts as well. So one's Necromancy skill will be incredibly powerful when you equip the Cloak of the Undead King.
Comment
I think this artifact is almost overpowered because it is easy to amass swarms of liches on large maps. I have played games where I have gotten over 500 Liches due to luck in finding the artifacts and Expert Necromancy before level 5. At any rate it increases the sheer power of Necropolis even more.