Towards the middle of the zone (up the ramp near Wuoshi and to the left) you will find Sabstin V'Despth ( 838, 133, -584 ) /waypoint 838, 133, -584 a non-aggro NPC. Talk to her and she will aggro, 93^^^. Every 25% health she will summon a 93^^^ add that is best killed before you continue with her, or you will end up with all three adds on you.
You do not need to kill any of the trash in the zone if you can avoid it, however you may want to kill the Withered Guardian ( 666, 128, -524 ) /waypoint 666, 128, -524 (non-aggro 94^^^, across the bridge to the left of the zone in) and Sawtooth the Corrupted ( 783, 88, -600 ) /waypoint 783, 88, -600. If these are killed before you engage V'Despth they will not be summoned during the fight.
NOTE: I cleared the entire zone before engaging her, and she was unable to summon any help during the fight, making for an extremely easy victory.
Once dead, examine the flower just below where the Sabstin V'Despth was standing. ( 816, 106, -603 ) /waypoint 816, 106, -603
Examine the Stone of Sorrow, it will tell you to find Firiona Vie. Her location depends on your alignment:
For good-alligned players, she can be found inside a building in Kelethin. ( 423, 136, 261 ) /waypoint 423, 136, 261
For evil-alligned players, she can be found inside the Shadow Oak in Darklight Wood. ( 445, -23, -266 ) /waypoint 445, -23, -266
You must now gather 3 items from three Destiny of Velious instances. These may be done in any order and can be gathered from cleared instances:
Iceshard Keep: Inside the treasure room on the right side of the main building, between the chests on the right side ( -463, 120, 403 ) /waypoint -462.91, 119.59, 402.54 or at ( -438, 118, 426 ) /waypoint -437.73, 118.27, 426.38.
Forgotten Pools: Inside the red/blue tree room, towards the back under a tree. ( -62, 36, -509 ) /waypoint -62, 36, -509 or ( -26, 39, -470 ) /waypoint -26, 39, -470 or ( -21, 42, -527 ) /waypoint -21, 42, -527
Crystal Caverns: Collapse: ( -70, 15, -74 ) /waypoint -70, 15, -74 Next to the alchemy table with the different colored potions. This can be done solo if sneaky enough.
Speak to the Firiona Vie.
Gather earth and air from the Plane of Growth:
Gather earth from the burial site of the Heartwood Master, located at ( -736, 6, -336 ) /waypoint -736.19, 5.50, -336.43 in Lesser Faydark.
Gather air from 10 wisps (green shinies) from Tenebrous Tangle. These are found on the tiny islands surrounding the larger islands in the zone. All you need to do is fly through them.
You receive Druid's Divining Rod, which you need to use at the Tree of Blight in Eastern Wastes. When used, a 92^^^ Wetrot will spawn, easily solo'd. It will drop a non-trade item, but it seems to update the group.