Millennium Ring

In rereading the Memory Arc manga, it seems to me that the Millennium Ring is easily the most powerful of the Items, not even saving the Puzzle. From the beginning, it can do things the other Items can't. Even when Bakura Ryou takes it off, it manipulates and seduces him into wearing it again. Honda took the Ring and chucked it from Pegasus' castle into the jungle, yet it still found its way back to Bakura's neck. 

Also, the Ring gave Bakura the ability to seal a bit of his soul inside the Puzzle. 

Now we might say that this is because the Ring was infused with Zorc's spirit after Bakura and Atem's souls were sealed away in their respective items, but that doesn't explain everything either.

In Memory World, as soon as Bakura dons the Ring, he becomes ten times stronger than he was before. The evil of the Ring's former bearer before Mahad is touched upon, but never further investigated. I think we'd need to know more about the former priests to find out the real story behind the Ring.

The Ring absorbed the evil of its former owner.

I do wish Takahashi-sensei would make a prequel manga delving into the depths of not only Atem's life in Ancient Egypt, but perhaps touching more on the priests who wore the Items during Akhnumkanun's rule. Perhaps then we'd know where the Ring got its heart of evil from.