Can I say 3 stars for most of the story and then 4 when it really picks up, at the end?
I think this book could have been a lot more satisfying had it been trimmed down a little more, been tighter and faster. If I could tear out all the pages of lesser [or un-]importance, Talion: Revenant could have been a 5 star short story! The way it is, though, I can only give it 3.5 stars, rounded up because the ending deserves at least that.
Not that the pages I'd tear out were bad, mind you. They were just too far from the plot and lessened its impact significantly.