Game Update 104 built upon the foundation that GU103 laid, adding more features such as familiars, proving grounds, and expert raids. The team added 30 additional pets with the patch, some of which can be found in-game while others are only available for purchase through the store.
Another notable change was a big class balance pass: “With GU 104, there [is] a rather large balance pass which adjusts the outgoing damage across most classes, focusing primarily on Assassin, Wizard, and the Warlock class but most classes will experience some increase. Further updates have also been made to abilities for some of the support classes. This is by no means the final balance pass, and there will be lots of changes and improvements coming with the expansion.”