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Return to Asadel Yasurbah's Residence and speak to Asadel Yusurbah. Warning: Once the conversation ends, a solo 54 encounter of guards will spawn behind you.
Zone out and read a note on the ground near the Arena (-75, 178, 27)
The agreement: (Ogaming has a lot of alternative locations, but I recommend just looking). It's a small note on the ground (see image on this page, "a note").