Finalmente encontrei. É a série Cradle de Will Wight.
Goodreads resumo do primeiro livro, Unsouled :
Sacred artists follow a thousand Paths to power, using their souls to control the forces of the natural world.
Lindon is Unsouled, forbidden to learn the sacred arts of his clan.
When faced with a looming fate he cannot ignore, he must defy his family's rules...and forge his own Path.