Discussing last sacrifice (va) 'spoilers.'?

I liked it overall, but I felt the ending didn't really tie up all the plot lines of Eddie and Jill and Adrian (poor Adrian, he really gre on me in the last half of Last Scrifice). Oh and I still didn't get what the 'last sacrifice" actually was? The bond breaking- thats not really relevant to the book and doesn't make sense. But I was glad she ended up with Dimka