The shield of humanity (RWBY x Space marine reader)

My second book. Well I just saw the overlord been pretty enjoyable, and I thought, what if I made a story about a space marine lost in the world of remnant? we'll see how it goes. and I did this book because most of the others are just fucking harems with more of 50 women... I mean I'm going to get aids at this point :v. well let's go to the description :3

You are the finest of the emperor of mankind. you are the shield of humanity. you are a space Marine.
you are one of the most recent add to the Blood Ravens. a battle-brother to be precise. you were 16 when you got augmented. and now you are on the planet Cyprus Ultima, a knight world of the imperium. That was siege by a Ork horde. And later fighting to destroy Acheron along side of the chapter master Grabiel Angelos. but something went wrong and you got teleport by chaos sorcery to a unknown human planet... remnant.