You get a quest find out that's it's somewhere on the other side (metacritic.com)
I just make sure I go back and do other side quests or challenges or explore and gather and I end up leveling up a bit or getting enough shards to afford a better weapon or piece of armor and then I am able to tackle the difficult quest again and find it's a bit easier haha. (amazon.com)
my biggest negative and only about side quest, if you have 1 active side quest, you can't do other even if you do what other side quest is asking you to do. (n4g.com)