This isn't really a quest...they ask for 500g, and after you give it to them, you receive your reward.
Quest Link
Talk to the Von Helsons
Accept Quest
- Blood Drop Brooch
"An elegant Blood Drop brooch from the Von Helson sisters. Wear this item to show your allegiance to the Von Helson sisters."
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You can complete this quest 3 times.
CGI - Complete Gaian Itemlist
Organized listing of all items available on Gaia.