Sovereign's Finery Chest
Drops from Forgotten Treasure. Despite the fact that this toy is labeled with The Azure Span, it is actually a new toy for The War Within -- it's located in the Ringing Deeps and is unavailable until the expansion launches.
The 
is a toy found in The Ringing Deeps that grants a 10-minute transmog buff when clicked.
Guide awaiting review
Locate the treasure cave
Travel to The Ringing Deeps and find the cave hidden behind a waterfall near the water's surface at 52, 52.9.
Obtain the chest key
Open the non-glowing chest on the right side of the glowing purple treasure to receive a key.
Open the Finery Chest
Use the key to open the glowing purple treasure further inside the cave to obtain the Sovereign's Finery Chest toy.
Activate the toy
Click the toy to apply one of three appearance buffs: Golden Lord Outfit, Sanguine Aristocrat Outfit, or Skeleton King Outfit. The buff lasts 10 minutes and has a 1-hour cooldown.
Tips
You can click the toy multiple times before it despawns to cycle through different outfit options.
