I will admit that I wasn't really thinking about balance when designing these items -- it would indeed be foolhardy to give the party anything with this much power straight up. However, that's the whole point of the set really. Even if the party manages to recover 3-4 after years worth of effort, they still will not have access to the full powers of each artifact. Since most gaming groups have fewer than seven players, they would also have to find some trustworthy NPCs to wield the remainder if they ever wanted to unlock the full potential of the Seven.
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On the other hand, a group which has collected several of these would be strongly motivated to cooperate. I *think* that the price of betrayal -- losing most of their item's power and suffering additional ill effects -- is high enough, but more penalties can always be added by the GM. I never considered that the party might be motivated to recover these for someone other than themselves, but I like really your campaign idea. Thank you for the constructive feedback, and I hope that you enjoy the last three artifacts as well. :)
It seems that a lack of willpower would start a vicious cycle. Failing once might give the sovereign more trepidation the second time around, making it easier to fail. And so on. The reputation of the king would suffer publicly. I doubt such a ruler would last long on the throne with the strong-willed and power hungry about.
Of course, the reverse might also be true. A strong king, able to intimidate all law breakers would be perceived as unbreakable of spirit.
I tried to graze the other subs to see how they connected but didn't hit on a key. Is there something the owner does to activate these different powers? Quests or judgements he has to do for them to light up? I also didn't know what other items were meant "the others" as far as knowing when they were betrayed and losing powers. Seems that would be a good spot to itemize the items that were connected...or explain how the king links items with the ring if that is how it works.
This seems like it should be an epic item, a kingly artifact to be spoken of in whispers in future generations. I like it's potential, a seemingly innocent item, that with a band of willing warriors and a touch of fealty becomes a powerful warship, or an airship to command the skies.