Impossible. It's powerful word, if used correctly. It's barley mention in book 2 and 3...but it all started in book 1 Forgotten Sins. But out of all the words in the world, I used the word impossible. IMPOSSIBLE ENDING. Now why would I use such a word? Well, Restarting had quite the answers...
...
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My reasoning...
It's because you can't save everyone.

It's just like every ending in the book. Everyone dies.
Just in a flash.

So knowing this...
How will book 4 end up?

How will your story end?