Greetings from the Gallery is obtained upon completing the Statuary, Fine Art, and Antaam, Part 1 side quest.
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Missive: Greetings from the Gallery
Dearest Rook:
A wonderful thing: The Crows have recovered some of the Trevisan artwork stolen by the Antaam! Viago and Teia told me all about it when I had them over for dinner. Those loutish Antaam were about to take their ill-gotten goods by boat to Minrathous. Can you imagine? Selling the jewels of our artistry to some boorish magister's parlors?
Luckily, Viago's compatriots put an end to it. My heart felt three times lighter when I learned that, and I am sure yours does, too. You and your friends take care, darling!
—Mistress Trella