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Find a descendent of Orisin Deepwell. Talk to Olmyr Deepwell in the Hall of Conviction of Teren's Grasp in Kylong Plains at ( 1987, 487, -695 ) /waypoint 1987, 487, -695.
Find Orisin's Tomb in Kaladim. You will find the tomb in the Underfoot Cathedral at ( 1, 28, -410 ) /waypoint 0.79, 28, -410.
You are not the first to arrive! Neragul and his minions are already there. He leaves quickly, but a group of 3 heroic aerakyns level 103 will spawn and attack you. Kill them.
Search the Tomb of Orisin Deepwell. Click the tomb where Neragul was previously standing.
Track down Neragul, and retrieve the key!
Find Neragul's Cache: in the middle room where Grendish is located. Kill room as normal and have Grendish fly off. Near Grendish balcony, there is a large square on the wall and glowing in the middle, click this for the cache.
Return to Loremaster Dorondal at ( 472, -208, 275 ) /waypoint 472.41, -208.32, 275.22 in Thurgadin