"Yes. Oh, wait. The younger person gives half their remaining years to the older person, right? So that doesn't actually help. I was thinking that SW and CSZ are both extremely long-lived, so if they shared their lifespans, everyone gets to be (slightly less) long-lived together. But idk how the Dial would deal with a regular human sharing with someone like CSZ who still looks young after a hundred years in prison... doh!"

Oooooh, now I see what you mean, and I think you were totally right! :D I don't think it's 'younger and older', I think it's just 'giver and receiver'. On the other hand, I just checked, and someone has to be dead for it to work: "It means someone with the Hallowed Reincarnation Artifact can use it to exchange half of their own remaining life to bring back someone who’s already dead. After that, when one of them dies, so does the other."

But if it was adjusted so that a part of their remaining life could be used to heal someone (probably not even half of it in that case), then being really long-lived is definitely a cheat code. :D I wonder if then it would only give the other person the healing without the life span, though? But even then, they could heal people without a noticeable cost. :D