The Una Mens enforced the codices that governed the Fae universe – maintaining order in the Fae world and the peace truce between Light Fae and Dark Fae. They punished those who did not conform to, or who defied, the rules of the Blood Laws. The Grand Inquisitor and leader was The Keeper.
The Una Mens were created by The Blood King after the truce that ended The Great War to act as a council of impartial protectors of the Blood Laws and principles of Fae society, after rebels tried to overthrow the King and the Laws. Six Fae were chosen to become The Una Mens and each were given a sacred Papyrus Seed (also called Origin Seed) to swallow. They were stripped of their individuality, and together became a "single vessel of humility and justice" and of "one spirit". However, one of the chosen six (The Blood King, himself) failed to follow through with his obligation, stole the sixth seed, and disappeared from sight. Thereafter, there existed only five Una Mens. The creation of The Una Mens was soon found to be deeply flawed, as they upheld the Laws ruthlessly and meted out harsh punishment for slight transgressions.
A Fae Elder sent a Gargoyle to attack and bite Bo so that her blood could be tested, and as a result The Keeper informed Bo that her blood had chosen the Dark Fae as her side (Turn to Stone). Since her blood had decided for her, Bo was no longer unaligned and The Una Mens no longer needed to interrogate and punish her.
In Let the Dark Times Roll, The Una Mens told Bo that "the human doctor" and Bo's "terrorist pet" were enemies of the Fae and their deaths would be "most painful." When Bo reacted by chi-draining all five Una Mens in the chamber, they re-claimed their chi and drained some of Bo's in return, letting her know that if she attacked them they would reflect her own power against her, and she would become her own victim. The Una Mens summoned Trick and questioned how he came to arrive in the New World, not recognizing that it was The Blood King standing before them. Trick told them that The Blood King had become corrupt and had created harmful laws. The Una Mens then informed Trick that they had selected him to be the Acting Ash until a permanent Ash was confirmed.
At the end of the episode, after The Archivist presents the Succubus Declaration to them, The Keeper searches in the King's Book of Records for the Fae that sponsored Bo's alignment with the Dark Fae, and when the name Rainer appears on the page The Keeper, revealing fear, exclaimed, "No. It cannot be. Never again."
In Waves, The Una Mens are eventually confronted by Bo and Rainer (who was revealed to be The Wanderer in Destiny’s Child). When Bo appeared before the council together with Rainer, The Keeper told Bo that she had broken their laws again, because The Wanderer was not intended for their physical plane as it was his curse; which resulted in a battle after The Keeper told Bo that for her crime they would kill all of her friends before killing her. The battle concludes with Rainer (whose power was restored) using his ability of foresight to predict the attacks by The Una Mens and their guards, thereby managing to defeat and kill each one of them. The Keeper, barely alive, warned Bo not to follow Rainer or she would "Suffer a fate beyond [her] worst nightmares." Bo thereafter killed The Keeper, the last one of The Una Mens council.
Upon death, the powers of each Una Mens transferred to the sixth Origin Seed that was kept hidden by Trick among his artifacts in his vault beneath The Dal, making the last sacred seed the repository of all their powers combined.
The Una Mens act as One. They feel neither "love" nor "hate"; and are a dispassionate judge, jury, and executioner.
Mesmer: The Una Mens persecuted and exterminated the entire Mesmer species except for Vex, who was a child at the time and somehow managed to escape the massacre of his family. The Keeper claimed Mesmers were "problematic" – while Vex claimed the Una Mens feared Mesmers.
- "For your crime we will kill your claimed human, the doctor, the wolf, the siren. Everyone you love will perish. After you have witnessed their destruction, we will kill you." – The Keeper to Bo (Waves)
- "Succubus, if you do this, if you follow him you will suffer a fate beyond your worst nightmares. A fate even worse than your own whore of a mother. You will be dragged beneath Irkalla. Damned like the spawn of evil that you are." – The Keeper to Bo (Waves)
- In Babylonian mythology, "Irkalla" (also Ir-Kalla, Irkalia) is the underworld from which there is no return.
- The Latin adverb Una (derived from Unus) translates as "together" and "at the same time" in English. The adjective translates as "alone" and "one set of." Mens is the Latin noun for "mind", "reason", and "intellect". Latin words cannot be formed into a precise sentence that translates into exact English; however, the closest translation of "Una Mens" would be: "Of one mind."
- It is interesting to note that the declension of Mens is the feminine gender.
- "Una" does not derive from "unanimous" – which originates from the Latin word "unanimus", meaning "agreeing" and "of one mind", and also indicating "with one soul/spirit".
- 4.02 Sleeping Beauty School
- 4.04 Turn to Stone
- 4.05 Let the Dark Times Roll
- 4.06 Of All the Gin Joints
- 4.07 La Fae Époque
- 4.10 Waves