WESS'HAR WARS series

(Reader advisory: strong language, harrowing content, violence, sexual references.)

GEARS OF WAR series

(Reader advisory: strong language, harrowing content, intense violence. Like the game, in fact.)

HALO

(Reader advisory; moderate profanity and some violence.)

STAR WARS series

(Reader advisory: contains no strong language, but these are specifically adult books with adult and frequently harrowing themes, and so may be unsuitable for some younger readers.)