https://www.amazon.com/Calling-Tower-Saga-Book-ebook/dp/B01BDPBSAG
In the distant future the Human Primacy, led by the Council of Callers, rules the galaxy. But now one Caller has embarked upon a mad plan to elevate himself beyond all others. It's up to a small band of unlikely heroes to stop him before it's too late!
"A promising start to a serious-minded space-opera epic." - Kirkus Reviews