The day the Beclaimers entered the Portal Door and discovered Rokando
The age of mystery is the era before Rokando was discovered by the Beclaimers. It's abbreviated 'before discovery' in short BD.
The age of discovery began, when the Beclaimers discovered Rokando. It's abbreviated 'after discovery' in short AD.
After having a vision, Bargun Rockhand starts the Followers of the Moon and Hammer
Shortly after exploring the new region, Bargun Rockhand proclaimed himself King of Rokando.
After hearing word about a foreign land filled to the brim with magic energy hundreds of people emigrated over towards a new home
To celebrate the dawn of the dragon's year, many adventurers set out to explore the other main isles of Rokando in the name of their king.