In order to progress, you must open the chest at ( 75, 6, -91 ) /waypoint 75.20, 6.01, -90.99. To open it you must have a Heavy silver key (dropped by Squallic Destroyer) and a Tiny brass key (dropped by Himai Kah'Bum). Note that if either of the bosses are grey, you will NOT get the respective key and must wait for a zone reset. Recommended to be around or mentor to Level 85 to take them on.
Shortly after the Shissar were run out of Kunark, a resort by the name of Veksar was built by the Kylong Iksar Tribe. After standing upon a lake in the middle of Kunark for nearly 1,000 years, Veksar was destroyed by a dragon, Garudon, and sunk to the bottom of what then became known as the Lake of Ill Omen. After Veksar's destruction, it was said to be inhabited by sealife and the spirits of those killed in the incident. It was also said that the spirit of the dragon Garudon also resided somewhere in the ruins. Post-shattering, the ruins of Veksar were rediscovered in the Fens of Nathsar.