You must have Deru in your party to initiate this quest and access to Aman'lu by initiating Act II, Chapter 1 (The Town of Aman'lu). If you do not have her in your party and haven't previously recruited her, she can be found in Eirulan. Teleport there and head north past the tramway to the Inn to the tramway to the Outpost, where she'll be standing near the entrance. Speak to her and have her join your party. Then head back to the south and teleport back to Aman'lu.

Head east from the Aman'lu transporter by going down the ramp and then down the short hill, which follows it. Then turn south once you see the fallen pine tree to the east. Head along the river to the south into a small cul-de-sac, where your party will find Prospector Albain, who oddly seems to be down on his luck and ready to give up treasure hunting because of his inability to find the treasure indicated by the treasure map in his possesion. If you have Deru express interest in the Prospector's_Map, he'll give it to her along with his Prospector's Key, which opens the door down below Razka's Ruins in the Southern Greilyn Jungle, which your party may have previously tried to open, but could not.

Teleport from Aman'lu to Eirulan, then to the Southern Greilyn Jungle. Note the slowly flashing star on your small compass and head east down the path towards and then down into the bottom of the ruined amphitheater. Step on the circle at the bottom and activate the switch to descend into Razka's Ruins. Head south along the corridor, battling the Morden along the way, until they approach the locked door. Select Deru as your active character, then left click on the door to open it.

Enter the next chamber, where your party can explore the side chambers for some armor and weapons. When ready return here and open the next door to the south to reveal a Big Chest in the room beyond. Enter and open the chest to receive some gold, Razka's Riddle (Use the key in the frozen heart of the corrupted forest.), and a Silver Riddle-Inscribed Key (This key opens the way to the icy heart of the corrupted wood (i.e. the Frozen Cave in Arinth's Ravine)).

    

Teleport back to Eirulan, then to Aman'lu, and finally to the Eastern End of Arinth's Ravine. Use the 'Tab' key to bring up the larger map and you'll see a slowly flashing star to the west. Follow the path towards it, crossing over the ravine via a bridge, when they come to it, then turning west. Once they round the bend, head south toward the entrance to A Frozen Vai'kesh Cave and enter it. Continue south into the back of the cave and left click on the locked door, with Deru selected as the active character, to open it with the Silver Riddle-Inscribed Key.

Proceed down to the end of the corridor and open the Big Chest with Deru as the active character and they'll receive some treasure, Razka's Second Riddle (Seek water in the heart of the desert.), and a Gold Riddle-Inscribed Key (In the sands of northern tears lies a timeless deception), which opens the door down in A Magical Oasis in the Northern Plain of Tears, which your party could not previously open. Teleport back to Aman'lu.

    

You must have access to Kalrathia and the Northern Plain of Tears by initiating Act III, Chapter 1 (Restore Kalrathia's Water) in order to complete this quest. Teleport to Kalrathia, and then to the Northern Plain of Tears. Press the 'Tab' key to bring up the expanded map and you'll see a slowly flashing star to the east. Have them head toward it. Once your party gets there, enter A Magical Oasis and proceed east until they encounter a locked door, with the Chant of Health on a pedestal to its left. Have them grab the Chant from the pedestal, then left click on the door, with Deru selected as the active character, to open it with the Gold Riddle-Inscribed Key.

Enter and have Deru open the Big Chest and she'll excitedly exclaim at the quantity and quality of treasure but soon realizes that the seeking was more fun than the finding of the treasure and that perhaps she should be concentrating more on other tasks, thus completing this quest.