We don't have synonyms for hexalogy yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hexology, hexiology and sexology.
(n) :
A set of six works of art that are connected, and that can be seen either as a single work or as six individual works, commonly found in literature, film, or video games.
(n) :
A set of six works of art that are connected, and that can be seen either as a single work or as six individual works, commonly found in literature, film, or video games.