EDITED: 
 3.5 
 End up reading it after all. And I'm not happy with all I just discovered about the Luxen. And now I don't know what to expect from the last book in the Lux series. *sigh* Maybe I do know now what to expect now and I'm not...happy about it. Hunter was ok. I like him. But didnt love him. Serena was ok too. Didnt love the book. My problems, I think, are that I love Daemon and Kat(and their gang)so much, I missed them and the writing, the things the caracthers saw, thought and said were(sometimes) almost the same as some things the caracthers from the other series(which only added to my "I miss them" feelings lol) said, thought and saw. After being so inmerse in the Lux world my mind dont want to welcome what I just read in Obsession. But if you are a fan of Jennifer Armentrout you need to read this. Just keep in mind that sometimes knowing the other guys side of a situation... can suck. 
 If you havent read the Lux series I think you will end up enjoying this book much more than I did. I think knowing in advance a couple of things about the Luxen can be a good thing before you start the Lux series. And really...you need to meet Daemon, so go and pick Obsidian. 
 Coming out in...May...I think. 
 I have my doubts about this one. An Arum?! IDK if I can trust one. After all...well...so far nothing good comes from them..right?! Wait and see.