The Pristine Jade Dolphin was actually the aquatic demon beast called Gigi, the same one who was at the Under Desert Sea's exit. Rean was told that he could find the dolphin in the City Lord's mansion, so that's where he went.
"Halt! State your reason for the visit," said the guards at the front.
Rean looked around and could see many more guards, all in matching uniforms and positions. That showed how well the security was around this place. "My name is Rean. The Formation Guild sent me to meet Senior Gigi." Rean then showed his badge to the guard.
"Very well. We have been waiting for you." The guards then opened the way and let Rean through. Inside, one of the servants guided Rean to the City Lord's office, where the Pristine Jade Dolphin could also be found.
Outside the room, Rean could hear the voices of the City Lord and the dolphin speaking.
"So the Flash Beast is now running rampant in Treavin Continent?"