How would I go about adding a brand new ability to an artifact?

[Upper_Krust]

It seems like I need to look up the 5e Books for some of this stuff.

It should all be online in the SRD.

 

[FleshEatingBlackFlutterby]

I have an artifact, that wants to have the ability to utilize and/or summon previous users of said artifact that died wearing/using it, but I don't think that there is anything in the books that would enable this. If I were to make a new ability for this artifact to use, what rank would be balanced for it?

This honestly sounds like a Transcendental variant of Redivivus.