so i am busy reading all the HH series books and started reading them in the "correct" order starting with galaxy in flames. however, i recalled the osirian psybrids and wantes to read up on them and noticed they are spoken of in the Horus Herecy series book five: Tempest. Is this another series about the Horus Herecy? if so, who is responsible for publishing this series of books? cus i didnt found these books in the series that i am reading currently.