Shaping the Dreamsurge

Since the quest gives exactly zero guidance...

For one, the listed zone as of this posting is incorrect. It seems you're supposed to be looking in the same zone as the Dreamsurge is occurring (right now, Waking Shores).

For two: this is a flying thing. Cruise around the zone on your dragonriding mount and you'll see bright green orbs, often under rock arches and stuff. Just fly through them to collect them.

Edit: Also found in green-white "plant" nodes called Dreaming Growth you can find on the ground. They are not restricted to herbalists, but only level 70 can interact with them.

Update now that I know some more about it: Dreamsurge Coalescence comes from most activities in the zone. It drops as loot from kills, for example. But there is still some confusion: There is only this quest given each week in the Dreamsurge-affected zone. However, you must complete it in the zone where you picked it up. If you're not done by the weekly reset, you'll either have to wait a few weeks for it to be in the "right" zone again, or drop whatever progress you had and pick it up fresh in the new zone.

This is a repeatable quest weekly, and character-specific, meaning every character can do it weekly (unlike the time rifts where the weekly is account-wide).

Sources for [item=207026]:

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2. Collect by flying in the current Dreamsurge zone. Found under arches/ bridges. Gives around 5 [item=207026] per. Looks like https://imgur.com/a/OReLCxX
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4. Click on [object=406385] found randomly on the ground. Gives 1 [item=207026]. Looks like https://imgur.com/a/6oAB4Jy
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6. Kill mobs in the Dreamsurge zone. Gives 1 [item=207026] per.
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8. Do world quests in Dreamsurge zone. Seems to give around 10 [item=207026] at the end, plus the 1 [item=207026] you get per quest mob.
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10. Recommended: Kill empowered rares in Dreamsurge zone--this is the 2nd most profitable. I got 24 [item=207026] from 1 empowered rare. (It announces in chat when a rare is empowered.)
    The addon Vignette Announcer (not mine, all credits to author) puts clickable coordinates in chat to create a waypoint to the empowered rare once it's announced. So convenient.
    
11. Recommended: Kill the boss from the fire portal that pops up in the Dreamsurge zone every 30 minutes. You will see a fire portal icon appear on the zone map at the top of the hour and 30 min after the hour. This gives 39 [item=207026], making it the most profitable.
    
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    • If in Waking Shores, it's at /way The Waking Shores 41.1, 77.3.
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    • In Ohn'ahran Plains, it's at /way Ohn'ahran Plains 21.4, 60.3.
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    • In Azure Span, it's at /way The Azure Span 33, 40.
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    • In Thaldraszus, it's at /way Thaldraszus 61.5, 26.5.
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*If you are on an alt and you cannot see the rares in the Obsidian Citadel, go to /way The Waking Shores 25.1, 56.5 . Talk to [npc=198751] and say you want to skip through to unlock Obsidian Citadel. (This will only work if you already unlocked on a main, of course)

With TWW expansion, this quest still exists and can be turned in, but it no longer offers any rewards. It seems to be on the Warband system where it can only be completed 1x.