There are 2 books in The Radiant Emperor Duology series.
The Radiant Emperor Duology series does not have a new book coming out soon. The latest book, He Who Drowned the World (Book 2), was published in August 2023.
The first book in The Radiant Emperor Duology series, She Who Became the Sun, was published in July 2021.
The Radiant Emperor Duology series primarily falls into the Alternative History, Historical, Science Fiction and Fantasy genres.