You can participate in Battlefield of Valor by pressing the Arena button on the main menu (≡) every Sunday.
Your Dule Arena rank must be within the Top 100 to participate, and Finals are held after concluding with the Preliminaries.
Preliminaries begin 6:30 PM (your server local time) and the top 1-5 ranking adventurers of each preliminary group will advance to the finals.
The Finals begin 6:50 PM (your server local time) and reward will given according to your rank.
Each match lasts 5 minutes, but winning the finals will make you the reigning Duel Incarnate of the season.