I'm doing GEO AF3 quest right now. I'll make edits to this post as I go along.
Step 1: Talk to Sylvie in Western Adoulin. She talks about her father, and a Communion. She says to go to J-6 (in the northeast) I'm going to assume she's referring to Morimar Basalt Fields.
Step 2: Go to the "Ergon Locus ???" spot at J-6 in Morimar Basalt Fields for a Cutscene. It's the exact same spot you spawn the Malboro NM for your initial GEO AF quest. The next hint is "It sleeps where the frozen flower hangs over boiling magma"
Step 3: Go to H-7 in Morimar Basalt Fields. It is directly below the Ergon Locus "Frostbloom". Check the ??? there for a long CS.
Step 4: Return to Sylvie in Western Adoulin. She will give you the option to choose key items. Each one corresponds with each of the Crags (Dem, Holla, Mea) in the Middle Lands. Each one has a level associated with it. Holla is 109, Dem, 125, and the blank entry is actually Mea, which is 135.
Step 5: I personally killed the Lv. 109 NM (a BRD Ghost NM) I was able to take it down with Aero easily after a few tries figuring out a weakness. You get a key item "Pale Azure Cloth" after defeating the NM
Step 6: Return to Sylvie, who prompts you go visit Wescolina in Western Adoulin. She will give you a key item "Treatise on Azimuth Clothcraft" Wescolina then prompts you to visit a Clothcraft master in Selbina, but doesn't give a name.
Step 7: Speak to Helina in Selbina in the Clothcraft Guild Salesroom. She will take the "Pale Azure Cloth" and "Treatise on Azimuth Clothcraft" key items and instruct you to wait. (guessing next game day)
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