You will need to do the entire Oru hunting quest to kill a gamor to get this. You will need to help Sadar fix his boat with a zeedog plant, then take his boat onto the island to talk to oru and head back to talk to the merchant and shamaz. You will need to buy the info and one plant from the second Cyana merchant who sends you into Darosham which has 3 plants you need, the 5th you need to take Zidars boat to Zorkatraz and give the tooth you found into Darosham to the prisoner for the 5th. Then head to the sunken house(temple) near Cyana and tell the treasure hunter to push a button with you, inside the house is Oru's gun, then head back to Oru's island and on the north side is a jumping path on the water. You will need to pick up 5 plants on the ground on the next island there and head back to Oru with all of those items to cutscene teleport onto the gorgor island. You can kill it with regular guns, once its dead stand next to it until you have flys buzzing around you and swim to the northeast island, diving would make the fish instant kill me so don't do that, open the metal box for the mon and you are moved off the island.