These series of quests start with [npc=209318] for me, being at chapter 4/7 Guardians of the Dream.
Then [npc=210646] starts:
After that short quest, [npc=210524] gives:
The reward for druids only is [item=210645].
The series don't end with [npc=211821]. Go back to [npc=209318] at the Central Encampment and he will have a new quest:
Then [npc=210587] and [npc=210585] start respectively:
While collecting Bloodied Armor Scraps, mobs will drop [item=208775]:
Seems like Ashphodel Research Notes is a requirement for [npc=210587] and [npc=210585] to start:
After that, you will find [npc=210587] alone with a last quest: