Books like Battle for the Abyss

This one turned out to be a nope for me. Not the worst idea behind the story, but the narrative is rather blurry and plain. Loyalists are not horrible, yet they lack character development. Word Bearers are my main problem here, they are portrayed as a total chiche. Zero depth, they are nothing more than mustache twirling villains who only want to do evil shit. Also they are ZEALOTS. I swear I haven't heard the word zealot (and it's variables) as many times in my entire life as the author uses it in this book. Synonyms, dude! Use some synonyms! The story is not important to the main plot of the series, I would not say it completely terrible, but rather just unnecessary. Gained nothing from reading it.