Can't complete all the bits for the bow. How do you access last section covered by mist?

The only way to move on is to complete the task prior. Sometimes there will be a line batch of grass that you can't realy see until you zoom in but clear all the fog and most of the time you wil find something. The game is still beta so you will have glitches. If you can't find anything you need to send a message to the developers. You can do this through he game or go to the facebook page and you can message them there and an email also.

Keep clearing grass all over and gate will open.