Game Informer writes:
"This is a lengthy post full of spoilers about one of several endings, it requires time to read and absorb, so if pressed for time or with lack of desire to read about an ending - move on now.
The point here isn't to necessarily spoil the game however, it is to explain away players' disappointment with the "Dark Ritual" ending as I heard and read many players are. It is important to note that the game does a very good job of ensuring that all rewards have their own consequences. Saving a life costs a life and eerie balance is at play the whole game through."
Warning, Spoilers ahead.