Story-related, cannot miss.

The entirety of chapter 5 will see Senua and her band of merry men head to Bardavik to get help to head to Borgavirki, but in order to get Astridr’s help (and her people’s), you need to defeat Saegirr and save the village of Bardavik from almost certain doom. Once you’ve done that, you’ll not only finish chapter 5, but you’ll also unlock ‘The Storm Calmed’ achievement.