There's a lot of stuff to do after you hit endgame, some of it nice and casual and other stuff which is fiendishly difficult. Next month we'll be seeing patch 2.2 as well, which will be introducing even more content.

The game does have an "ending," though it's really just a big cadence in the game where they decided to put some credits. The storyline will continue after you've completed the "final" quest, and a whole lot of extra stuff will be unlockable. Much of the endgame content centres around acquiring and improving your gear, while there's a really good challenge on the way there. Things like Coil, hard/extreme mode primals and the harder dungeons will definitely keep you occupied for some time, while you work through the content. A vast majority of the people in the game haven't beaten coil yet, for example.