Honestly, if the author is going for a happy ending (which is the impression I have at the moment), I predict that either Caire will pass his immortality to someone (maybe the young master/Sir Knolls) or Rune will decide he wants Dia to be happy more than anything and give his immortality to her so she can be with Caire. But who knows? Maybe the author will go bittersweet and just have them spend Dia's lifetime together, or maybe they'll figure out how to cure the vampirism all together. I think we're not close enough to the end to know for sure yet.
honestly i never thought of the possibility of Caire passing his immortality but I've been giving thought on Rune passing his to Dia. Either way, I just want all three of them to be happy cause they all deserve it.
Soooo are we gonna discuss the fact that when the rite or the process or whatever is complete Dia will be mortal again and their time together will have an end date. Or is is possible for Dia to be immortal again?? cause I want my babies to be immortal and love happily together （/TДT)/