The Matriarchal Eden
Friends in high places...
The matriarchy tends to prefer feminine traits, but they don't share the same idea of what it means. Feminine attributes include compassion, patience, and grace, but the eden also view independence, aggression, and dominance as feminine. Humanity often labels these traits as masculine. Eden society Is huge, and they don't have many social pressures placed on them to conform. The eden tend to gravitate to what best suits them in their opinion, which leads to a remarkably cohesive society among the different ethnic groups. There is next to no variation. Almost all those in the matriarchy will feature some combination of the aforementioned traits. As it would happen, the eden translation for masculine and feminine ends up being the same word, a word meaning the nature of one's character. They don't differentiate the two like we do. The Eden are born without gender, and actively choose their gender and biological sex when they come of age, if they choose to have either. They don't have gendered words in their language. Their language features no gendered pronouns, meaning the only pronouns are usually translated as them, and they.
The Eden don't quite understand our rituals of courtship and the idea of marriage and even monogamy baffles them. The Eden have some concept of romance, but it's usually a brutally honest affair. They don't dance around the topic like we do, waiting for someone to muster the courage to speak up as they probe one another with flirtation and innuendo. Romance among the eden species moves fast and is completely emotional. Let me say that again: they will blatantly address their attraction and seek romantic interests with little care for tact, yet most have little to no sex drive. While the asexual spectrum is broad, there are few who have the slightest inkling of lust, and those who do usually need to achieve a deeper emotional connection first. Xenophilia is not common nor advised for the faint of heart. They seldom have successful relationships outside of their own race. It's not for lack of trying. Their idea of relationships can be strange at best, to completely foreign and alienating for most species. If you're considering pursuing a matriarchal eden, consider this: Humans have a long list of romantic scenarios to share with their significant others. I understand the battlefield is noticeably vacant from that list, yes?
While the matriarchy is most known for its development of military technology, the eden species possesses unprecedented knowledge in medicine. Their age and technology helped, but this occurred primarily through frequent contact with other species throughout their existence. The Eden species have a keen understanding of biology and learned fundamental patterns of life that no other species could boast. Every species they meet either teaches something new, or affirms what they knew to be true. This understanding Is how the species managed to foster so many allies in the galactic community. The Eden's method of infiltrating species wouldn't be nearly as effective if they couldn't handle the exposure, but more importantly, they need to be sure they don't pass their own biological contagions to their would be allies. For this reason, eden physiology is both incapable of catching or spreading any known contagion. We have no idea how they accomplished this, but we believe their genome functions so differently from others, that the contagions are just not compatible.