The Treasure Fleet's returned from the Antispace expedition. Have the cargo's itemization checked, and then offload and distribute it.
—Atheria Valdayn
The Ethereal Treasure Fleet, more accurately called the Ethereal Treasure Fleets but typically referred to in the singular, were a series of mostly state-run interstellar treasure fleets created and maintained by the Ethereal Demesnes, though dominated by the twenty Core Demesnes, particularly the most powerful of all the Demesnes, the Kingdom of Luctanem, whose ruling House Valdayn tended to provide most of the funding and reap most of the rewards of the treasure fleets' efforts. The Ethereal Treasure Fleet was sent to a variety of locations throughout the galaxy over the course of numerous expeditions spread across millennia, but predominantly ventured into the Unknown Regions, Outer Rim Territories, and, later, extragalactic destinations such as Antispace and the Cradle.
The treasure fleets were known to be a prime source of employment for the pirates and privateers of Calt, the bank agents of Ynthera, and the treasury personnel of Xarkor, all of which had ideal training and equipment for running the treasure fleets. Various other Demesnes also participated significantly, such as the Golden Republic of Kora Kask, whose Golden Sentinel Service sometimes participated in protecting cargo of the Ethereal Treasure Fleet.
One of the most well-known expeditions of the Ethereal Treasure Fleet was the 2566 BBY Ethereal Treasure Expedition, which moved to secure a significant load of precious metals and artifacts on several worlds in the Gevrael system in the southern Outer Rim Territories before temporarily spreading out to nearby systems in the same and adjacent sectors in order to keep such artifacts out of the hands of other interstellar powers and individuals.