Name: Sirens

Theme: Hypnotic Diplomats

Unique Gameplay: 

The Siren's call: Enemy ships have a chance to defect every time they battle with the sirens. Moreover, all trades somehow end up in the favor of the sirens though they initially seem fair.

Faction Biography: Siren society has developed to ultimate politeness, to the point that it became a contest of wills. Over time, this developed further to the level of becoming a sort of psychic persuasion. Often mistook for a lack of adversity, siren society's peaceful and polite outward appearance should not be mistaken for anything but the den of hypnotists and grifters. Despite being on equal footing among themselves, the sirens found their persuasive talents to bias most things in their favor.

A very cool and unique concept. However their powers make them feel like a strong military faction rather than a "diplomatic pacifist" one for this contest. Maybe you could alter this concept of a Siren race that tempts other race into a more diplomatic-based powers rather than military?