Oh. I forgot to mention The Roar, The Whisper etc. series of books.
It's about two twins who got separated by the goverment who makes the twin practically a warrior with her approval. The government after a while gets more greedy, spiraling into their demise when they're own warriors back stab them.
It's a really nice book that I remember for years before I knew there was a sequel. I know your gonna enjoy it.