Click on the Treasure Chest underwater. ( -66, -8, 510 ) Copy/waypoint -66, -8, 510
Click on the Water Logged Scroll on the beach. ( -92, -3, 464 ) Copy/waypoint -92, -3, 464
Place 5 fish on the basket of fish at ( 20, -3, 451 ) Copy/waypoint 20, -3, 451. They are movable, and will be along the shore or around the edges of pools of water, but not actually in the water.
a fish
After moving all five fishes to the basket, you will receive a messages "A deep sounding tone echoes along the coast as the smell of rotten flesh drifts in the air" and Fhoorl-Kurrat with rise from the depths. Kill him to get the key.
Return to and open the treasure chest to receive the Hand of Glory. ( -66, -8, 510 ) Copy/waypoint -66, -8, 510