You may want to do this access quest at the same time you are doing The Riddle of Razorwing, part of the Claymore Timeline, as the steps for the first two floors are identical.
The quest itself has only one stated step: "I need to gather the symbols that Ritnoc told me about and take them to him." You will not receive quest journal updates for the four symbols you must loot.
Globules of 'accumulating energy' will spawn and begin to revolve around the statue at the center of the room. After a couple minutes the big globule will die and the prophet swill spawn where the NPC was.
Pull Sharti off the pedestal and engage her on the floor, otherwise you may be unable to loot the symbol.
There is a wing buffet attack, the tank should stay against the north wall to mitigate the knockback.
As soon as you use the Effigy, immediately move to the north wall. Avoid using melee pets during this fight to avoid the spawn of heroic adds. You are encouraged to remove melee pets, set mage pets to maximum distance, have the tank melee, and all others should stay ranged, if possible.
Return to Ritnoc Flyfeather outside the instance with all four symbols in your inventory. ( -182, -166, -275 ) Copy/waypoint -181.9, -165.59, -274.89