Holoviewer: The Scarlet Queen
Drops from Opera Chest.
Holoviewer: The Scarlet Queen is a Dragonflight toy that drops from the Opera Chest inside the Zskera Vault, summoning a red hologram of Alexstrasza atop a small flaming machine for 5 minutes.
Guide awaiting review
Obtain a Vault Key
You will need a 
Zskera Vault Key to unlock rooms inside the Zskera Vault.
Locate the Opera Room
Head to the top floor of the Ur Vault and look around for rooms containing Dusty Projectors and an Opera Chest — the Opera Room contains interactable objects that project holograms matching the toys.
Unlock and Loot Chest
Use a Zskera Vault Key to unlock the door to the Opera Room, then loot the Opera Chest inside to have a chance at receiving Holoviewer: The Scarlet Queen.
Tips
After completing the intro quests for vaults Az, Ix, and Kx, the Opera Room appears to have a very high chance of spawning in the vault each week, so opening all doors on the top floor may be the most efficient approach.
The Celestial Transocular, found on the second floor of the vault, lets you see interactable objects like the Opera Chest through walls before spending a key on the room.
Using this toy during a dance party in the Auction House will cause the Alexstrasza hologram to dance.
