The species' top ruler was known as the Prime Lukythian. According to the late Chief Protector of the Prime Lukythian, Aeryn Sun and two other (alleged) Sebaceans invaded the Lukythian homeworld, shot their way into the governing chambers and assassinated the Prime Lukythian. The Lukythians managed to induce a bioengineered, genetically encrypted strain of Sebacean heat delirium in the attackers (including Aeryn Sun) before they escaped.