Metaphor: ReFantazio

Story-related, cannot miss.

Once you’ve dealt with the Charadrius in Port Brilehaven, you’ll leave for Virga Island on 08/14, arriving a few days later on 08/17. When there, on 08/18, you’ll be tasked with saving the Priestess and at the same time retrieving Darkodios, a legendary divine relic.

The quest deadline for both of those operations - which are inextricably linked - is 09/05, and once you’ve saved the Priestess and obtained the divine relic from the Dragon Temple, you’ll then unlock the ‘History Untold’ achievement and be ready to move back to the mainland.