Step 1 - Talk to the Blue Dragon here.
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Step 2 - Visit his profile and watch the preview trailer.
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Step 3 - Talk to the Blue Dragon again and receive your reward.
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- Blue Dragon Tail
"This shadow dragon tail embodies the tremendous power of the legendary dragon."
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You can complete this quest 3 times.
(I entered a room that filled up before the page fully loaded, and I got the item without having to view the trailer.)
This quest is no longer available.
CGI - Complete Gaian Itemlist
Organized listing of all items available on Gaia.