My question is I have only base game which I ' ve bought on relese what do I need and do I really need to to enjoy full game ? Is expansion mandatory ? What do I lose ? well you can only play the core game , you won ' t have access to Masteries , Elite specializations , new Legendaries old legendary quest chain , you will unlock season 3 episodes when you log in at the time but won ' t be able to play them , can ' t get on the maps , tons of achievements , no Raids . PvP will probably be really hard because the elite specs are the way to go there . It is worth it , and you can always drop back into the game . But what you need to think about is why you left the game in the first place . <| sep |> the affect you say they have on the body is . It ' s also undoable , reversable , and probably changes often . And even that is negligible , like I ' ve said about three times now .