"hmm. That's a tall order. Regarding how powerful artifacts could, many would say that the Wordlforge is the most powerful build yet. And since it were capable of creating new worlds it could be argued that its powers are unlimited.
However since the powerveins are so unstable these days it's hard to say how powerful artifacts one would be able to create.
And as for an artifact which binds people together, there are examples of this with the banner of Unity as well as Adamant. These banner people would swore their loyalty and soul, and thus were connected.
Others use spells to force people together rather than artifacts"