What a fucking arc, man. This was so incredibly well done, just damn. I like how the scene with Helena at the end and her words pretty much completely summed up what I feel this arc was about. By killing them, Elijah ultimately became like them in a way and can probably no longer turn back. Yet, with Helena forgiving him it's got to alleviate some of the pain he feels. It's a complicated turn of events that I honestly can't find the words for to say how I accurately feel, but I don't think I've ever experienced a story in anime/manga quite as well written as this.