Oryx's worm didn't feed on death and conquest, that was his sister's worm (forgot the name) Oryx's worm fed on exploration. So unless you're travelling VERY far with ToM, it probably won't bring him back.

From "Calcified Fragments: Insight" [spoiler]I have made preparations. If I am defeated I know it will be because my understanding of the universe was incomplete. I failed to anticipate some strategy, some nemesis. (Perhaps Taox, if she still lives.) If I am defeated, I know that I will fall to something mighty. Something that craves might, something that loves what I love, which is the Deep, a principle and a power, the versatile, protean need to adapt and endure, to reach out and shape the universe entirely for that purpose, to mutate and redesign and test and iterate so that it can prevail, can seize existence and hold it, certain that this is everything, that there is nothing to life except living. And it has two faces, yet it is one shape. One face is the objective, which is obvious, and the other face is that will to sacrifice things and ideas for a single mission, the mission of becoming the shape, a shape that will not relent, the utter commitment to survival, to draw the right sword and choose where to cut: to allow this hunger to become your weapon. So I will prepare a book, which is a map to a weapon. And my vanquisher will read that book, seeking the weapon, and they will come to understand me, where I have been and where I was going. And then they will take up my weapon, and they will use it, they will use that weapon, which is all that I am. And armed thus with my past, and my future, and my present (which is a weapon, a weapon that takes whatever is available, a weapon bound to malice), they will mantle me, Oryx, the Taken King. They will become me and I will become them, each of us defeating the other, correcting the other, alloying ourselves into one omnipotent philosophy. Thus I will live forever. I’ll make sure.[/spoiler] So it would seem you are partly right: the weapon DOES grant Oryx a form of eternal life, but it by his own design, no Eris'. She just fell for his ploy.

Why do you idiots think eris is evil or bad? No where in the games story [spoiler]or what counts as a story in this game[/spoiler]or lore is she ever portrayed as anything less than maniacally anti-darkness.....

I don't think Eris is evil

I thought it was Oryx's black heart, not the worm itself... Oh well...