The Dravyn family Auction!
This was for two reasons: to ensure a legitimate and fair auction and to protect the family who sponsored and held the auction. A strange clan of vampires that, although they served the king and royal families, also chose a neutral path and broke away from any succession battles for the throne in the future.
So, to visit the highest level of auction once every six months, the Dravyn family would transfer their auction house venue between the selected worlds by the Nexus council. A council of all the top races in the main seats and the minor worlds in secondary seats, with both sets needing to vote for anything in the Nexus to change.
Nikolai held his digital tablet for the arena and found the Dravyn Auction House tab, reading information about the Nexus. The council and how they avoided a tyrant or single entity from rigging the auctions for their benefit.