I really wanted to give you a higher rating but a few glaring plot holes in your story killed it for me. spoilers ahead. 1. the devourer is way too op. you basically killed your book, when the enemy can take out stars it's done. you will basically have to turn your MC to a goku saitama fusion hybrid just to beat them. your talking universe ending opness. 2. your choice of world building doesn't make sense. you went from a super high tech civilization that will more than likely have powers higher than nuclear fusion since they are able to use warp technology. which means they can vaporize planets and they still loosing remember. then you threw the story in a backward magic based civilization with no space travel capability. come on dude that's like going way backwards. I can just keep going on and on but bottom line you need to power down the devourer by a lot. think enders game or starship troopers. op but not impossible to kill. your current devourer format is too broken and way too op. wish you luck.