Nuso Esva was an alien warlord who, by 0 ABY, had become a major power in the Unknown Regions. Possessing a very strong navy, he conquered many slave and tributary worlds, establishing a domain that stretched into Wild Space and to the very edge of Imperial space. Posing once as Imperial official Lord Odo, Esva clashed multiple times with Chiss Imperial officer Thrawn. In these engagements Esva displayed a level of tactical brilliance rivaling Thrawn's own.