Now go to all 3 bonfires and press the circle button to interact with them. Any proficiency you gain before unlocking the mystic art dojo missions does count to your proficiency, too.

I have been doing this method few days ago. Wreathed in Flame Kyushu Region — Automatic mission completion reward.

Credit to rubhen for the living weapon strategy. If you give him noble dungballs it will reduce the amount of normal dungballs needed.