Defeat Sanja Gusts and SanjaWhilrwinds southwest of the Dimita Oasis. Afterwards, speak to Captain Damien at the Dimita Oasis. Use your quest tracker to see your progress.
Captain Damien: I have a proposition! NakanoAzusa: What is it? Captain Damien: I would like to attack their base when the sanja guard Captain Damien: is weakened. NakanoAzusa: Their base? Captain Damien: Yes, according to what I hear, there's a sanja base in the Captain Damien: west. A sanja named Ryea is in command. We Captain Damien: need someone to attack the base! Will you do it? NakanoAzusa: Yes, I don't see why not. Captain Damien: You should plan to attack his subordinates first. I will Captain Damien: send some of the soldiers from the oasis to distract them. Captain Damien: We must take action or the sanja will encircle the oasis Captain Damien: again.