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.
While Bo had been on the Death Train she had become aligned with the Dark Fae. She wrote and signed a Succubus Declaration that was co-signed by her Dark sponsor. After The Archivist presented the document to The Una Mens, The Keeper searched in the King's Book of Records for the Fae that had sponsored Bo's alignment. The name materialized on the page and when she saw what it was The Keeper exclaimed, "No. It cannot be. Never again."
In Waves, The Una Mens are eventually confronted by Bo and Rainer (who was revealed as "The Wanderer" — but not her father — 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 combined powers.
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.
- DYSON: This is bigger than you think, Bo. The Una Mens power is ancient. – to Bo (Turn to Stone)
- BO: What kind of boomerang bitch are you?
THE KEEPER: Strike at The Una Mens and you shall be your own victim. (Let the Dark Times Roll)
- THE MORRIGAN: The Una Mens is cramping my style and they want every human that you love very, very dead. – to Bo (Let the Dark Times Roll)
- ROSETTE (THE KNIGHT): It was foretold that with the death of The Una Mens, the Pyrippus would rise. – to Bo (Origin)
- LAUREN: It took a council of six Fae to keep control of The Una Mens power. – to Massimo (Dark Horse)
- 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".
- 4.01 In Memoriam (mentioned only)
- 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
- 4.08 Groundhog Fae (mentioned only)
- 4.10 Waves
- 4.11 End Of A Line (mentioned only)
- 4.12 Origin (mentioned only)
- 4.13 Dark Horse (mentioned only)
- 5.01 Like Hell Pt.1 (mentioned only)
- 5.02 Like Hell Pt.2 (mentioned only)
- 5.04 When God Opens a Window (mentioned only)
- 5.05 It's Your Lucky Fae (mentioned only)