This item is part of the Quest "Traitor to the Validus Custodus"
It is obtained after you turn in the Water-stained note to Phenic Dionicas in Katta Castellum. He gives you a Sealed Message. The item lore for this item when identified says:- This item appears to be written in Common Tongue. Item Lore: for Markil's eyes only.
If you right click the Sealed Message to read it, it says "We have lost Halle, but her insticts have proven true. Do what you must. Contact Governor Tilbok if need be... and be cautious. - Phenic"