The Luxury Auction opened in Black Desert Online KR last month. A new auction will start later this month, and the Luxury Item will be Horse Emblem: Nightmare of Arduanatt. 

Horse Emblem: Nightmare of Arduanatt is an item that will give the owner Nightmare of Arduanatt, the dark version of Arduanatt the Pegasus. There is no maximum price, and each item will be put up for auction for 10 days. When a higher bidder appears before the current auction ends, the auction will be extended for 1 minute.

The auction for Horse Emblem: Nightmare of Arduanatt will start from Sept 29th 18:00 (KST), and the starting price will be 5 billion. 

Items to be sold at the Luxury Auction in September (KR)

Friday Sept 15th, 18:00 
 - Mainhand Weapon Exchange Ticket (7 days), Offhand Weapon Exchange Ticket (7 days), Awakening Weapon Exchange Ticket (7 days)
 - Starting Price: 2 billion

Friday Sept 29th, 18:00
 - Horse Emblem: Arduanatt, Horse Emblem: Nightmare of Arduanatt
 - Starting Price: 5 billion 

About the Luxury Auction: https://www.invenglobal.com/blackdesertonline/articles/2729/