Dysmorphia rated Moon of Three Rings: 4 stars
Moon of Three Rings by Andre Norton (Moonsinger #1)
Sequel is Exiles of the Stars (openlibrary.org/works/OL473399W/Exiles_of_the_Stars)
Sequel is Exiles of the Stars (openlibrary.org/works/OL473399W/Exiles_of_the_Stars)