E'thinaa was a Yuuzhan Vong operative (a male one) who operated during the Yuuzhan Vong War years. He infiltrated the Ssi-ruuvi Imperium, which was the governing body of the Ssi-ruu species, by disguising himself as one of them. Achieving the rank of general, he played a key role in manipulating the Ssi-ruuk to serve the Yuuzhan Vong's objectives. Furthermore, he orchestrated the Ssi-ruuk's attack on the planet of Bakura, a move designed to weaken both the Ssi-ruuk and the Galactic Alliance, the galactic government of the time. After the Ssi-ruuk were defeated, he dealt with and killed Prime Minister Molierre Cundertol of Bakura.
E'thinaa, a male Yuuzhan Vong, functioned as an operative within the Praetorite Vong, an advance group of Yuuzhan Vong whose purpose was to sow chaos throughout the galaxy as a prelude to the species' invasion. Despite the Praetorite Vong experiencing a serious military defeat on Helska IV in 25 ABY, E'thinaa persisted in his efforts to undermine potential adversaries. By 28 ABY, he had risen to the rank of general within the Ssi-ruuvi Imperium, the ruling power of the belligerent Ssi-ruuk. Skillfully concealed by an ooglith masquer, E'thinaa was instrumental in facilitating the ascension of the Keeramak, a Ssi-ruu figure prophesied in their legends. The Yuuzhan Vong aimed to instigate a conflict between the Ssi-ruuk and the Galactic Federation of Free Alliances, fully aware that such a war would leave both factions weakened.
He also forged an agreement with Molierre Cundertol, the Prime Minister of the planet Bakura. Maintaining the secrecy of his true origins, he offered Cundertol a new droid body, promising him immortality, in exchange for the Prime Minister's surrender of Bakura. Furthermore, E'thinaa pledged to provide him with half of the money Cundertol had spent on the droid body. Subsequently, the Yuuzhan Vong facilitated the transfer of his essence into the droid through a Ssi-ruuk procedure known as entechment. The procedure unfolded as planned, and shortly thereafter, the Ssi-ruuk initiated an attack on Bakura. As E'thinaa had anticipated, the Keeramak was killed. The Ssi-ruuk were compelled to retreat, and Cundertol, now residing in a droid body, rendezvoused with E'thinaa at a space station situated on the periphery of Ssi-ruu space.
At that location, E'thinaa reprimanded Cundertol for inquiring about the General's motives for wanting the Keeramak dead and refused to remit the money he had guaranteed, asserting that Cundertol had failed to uphold his end of the bargain. When an enraged Cundertol voiced his objections, E'thinaa presented the former Prime Minister with the opportunity to fight for it. Cundertol accepted the challenge, only to have E'thinaa activate a restraining bolt that immobilized Cundertol's droid body. The General then revealed his authentic identity to his horrified adversary. Other Yuuzhan Vong then entered the room and began to assault Cundertol with amphistaffs until his death.
E'thinaa dedicated himself to serving his species, striving to weaken potential enemies and pave the way for the Yuuzhan Vong's conquest of the galaxy. He concealed his true identity and manipulated Molierre Cundertol into surrendering Bakura. When Cundertol complained about being treated unfairly, E'thinaa mocked him and found amusement in the man's agreement to fight him. Like all members of his race, E'thinaa regarded Humans as an inferior species and their droids as abominations. He deemed Cundertol, now confined to a droid body, unworthy of slavery or a dignified death through sacrifice.