I really really really love this one! I got this as a Valentine's gift and I have absolutely nothing to complain about. 
I love Nightpelt and the outcasts. The elders making him feel wanted and useful and him teaching the same lesson to Volepaw when he hurts his leg? So sweet!! You can really sense this level of love and trust between all the outcasts and I loved that so much. It was such an easy comforting read too and I'll be happy to revisit it one day.
I loved how gorey this got for Warriors graphic novel/manga standards and I loved the art too! 
It also really changed my opinion on Clawface. Dont get me wrong, I still dislike him, but I always seem to forget him and Nightpelt are brothers and their relationship throughout this Graphic Novel was really interesting. Nightpelt genuinely wants the best for him despite his brother's awful behavior. It was kind of sad.
Despite it being a comforting read for me, the story was dreadfully scary all the same. I loved the tension and dread that surfaced in my heart anytime kits showed up. It breaks my heart!