The Poisons Ungu and Heroti: Symbols of Hidden Lethality and Coercion in Five Broken Blades

Understanding Ungu and Heroti in Five Broken Blades

In Mai Corland’s Five Broken Blades, poison is not merely a tool of assassination—it is a symbol of the disenfranchised who must weaponize their bodies to survive. Two specific poisons, ungu and Heroti, recur across Sora’s story, evolving from instruments of external control into emblems of her own endurance and defiance. This analysis examines what these poisons are, where they appear, how their meaning shifts, and their connections to Sora’s character and the novel’s central themes.

What Are Ungu and Heroti?

Ungu is a poison derived from an unspecified plant. Its effects include a slow, agonizing death: the victim’s limbs lock up, the tongue swells, and complete paralysis sets in while the person remains conscious and in “unspeakable agony” (Chapter 5). Sora describes the sensation from a microdose as “the strangling sensation…the locking up of my limbs, and the primal fear of helplessness” (Chapter 5). Ungu leaves visible symptoms and can take up to an hour to kill.

Heroti is a rarer, more sophisticated poison derived from a plant in the Outer Lands. It is undetectable in an autopsy, mimicking a heart attack. According to Sora, Heroti “leaves no trace” and “causes immediate, intense chest pain as you bleed inside of your chest” (Chapter 79). There is no known antidote, and during Sora’s training it killed five girls at the poison school. Sora herself was incapacitated for two months by even a “smallest dose.”

Where the Poisons Recur

(Other poisons like tabernacle and Erlingnow appear in chapters 29 and 38, but ungu and Heroti are the two most charged for Sora’s personal arc.)

How the Meaning Changes

From Tool of the Master to Weapon of the Self

In Chapter 5, ungu is imposed on Sora. The Count writes “ungu” on the calling card; she despises it because of the drawn‑out suffering it causes. She whispers the Count’s name to the dying lord, making clear that the poison is an extension of the Count’s power, not her own agency.

By Chapter 79, Sora has learned enough about poisons and about herself to choose Heroti for the most important kill of her life. She selects it because it is rare, trace‑free, and leaves no evidence—a direct contrast to the messy, visible death of ungu. Heroti represents her bid for independence within an impossible situation. Even though the assassination fails, the choice of poison marks Sora’s shift from a passive blade to an active strategist.

From Inflicted Suffering to Embodied Lethality

Ungu is a poison that attacks from the outside: Sora applies it to a mark’s drink or lips. It remains separate from her. Heroti, however, is ingrained in her very being. After surviving the poison school, Sora’s body itself becomes a delivery system. She can kill with a kiss because her lips are coated in Heroti. The poison is no longer a tool she wields; it is part of her identity. As the western count Rune says, she is “the most powerful poison maiden in Yusan”—a living weapon (Chapter 29).

This internalization parallels the theme of identity and deception: Sora must constantly hide her true nature, and her poisonous body reflects the secrecy she is forced to maintain.

Connections to Characters and Themes

Sora – The Hidden Blade

Sora is the primary carrier of the poison symbol. She was sold at age nine, dosed with a hundred poisons over ten years, and survived the death of seventeen other girls to become the Count’s assassin (Chapter 29). Every use of poison—whether ungu, Heroti, or another—reminds the reader of the cost of coercion: Sora’s body is not her own. Even her immunity is a cage. Yet in choosing Heroti for the king, she reclaims a sliver of agency, turning her poisoned body into a weapon of resistance.

Royo and Euyn – Periphery of Poison

Although Royo and Euyn are not poison users, they interact with Sora’s world. Royo’s own hidden guilt (he killed the woman he loved) mirrors Sora’s forced lethality. Euyn’s shock when he learns of the poison school (Chapter 29) highlights the moral discomfort the privileged feel when confronting the suffering that enables their power.

Themes of Betrayal, Guilt, and Sacrifice

The use of poison implicates multiple themes:

• Betrayal: Sora is betrayed by the Count, by Tiyung, and ultimately by Mikail (who destroys the crown in Chapter 79). Poison is the medium through which these betrayals are attempted or revealed.
• Guilt and Redemption: Sora expresses no joy in killing; she describes ungu as causing “terribly painful death.” Her guilt over being forced to take lives is palpable, and her ultimate goal—freeing her sister Daysum—becomes a quest for redemption.
• Sacrifice: The poison school required the sacrifice of seventeen girls to create one Sora. Heroti itself killed five trainees. Sora’s survival is built on others’ deaths, a foundation that haunts her.

Explore these themes further via the pages on betrayal, guilt and redemption, and sacrifice.

4 Study Questions with Answers

1. Why does Sora resent using ungu in Chapter 5?
Sora dislikes ungu because it causes a prolonged, agonizing death that she finds cruel. She would prefer a faster, less painful poison. The Count’s demand to use ungu reinforces her lack of autonomy; he chooses the method of killing, not her. Her resentment is a small act of internal rebellion.

2. What makes Heroti a “better” poison for Sora’s assassination attempt on King Joon?
Heroti is undetectable in an autopsy, mimics a heart attack, and has no antidote. Sora specifically selects it because it is “uncommon” and leaves no trace, reducing the chance of exposure. She also has personal experience with its potency—it leveled her for two months—and believes the dose she used (enough for five men) will be lethal even to a man thought immortal.

3. How does the poison motif connect to the theme of power and corruption?
Poison is a weapon of the weak against the strong. Sora, a young woman with no social power, uses her body as a delivery system to kill powerful noblemen. Yet the very people who create her (the Count, Rune) are themselves corrupt; they exploit her suffering for political gain. The poison represents the hidden rot beneath Yusan’s glittering court, where the powerful maintain control through horrific means.

4. In what way does Sora’s immunity to poison become a double‑edged symbol?
Her immunity is what makes her valuable as an assassin, but it also marks her as a prisoner of her own body. She cannot escape the Count because her body is the Count’s property. The immunity that should free her—allowing her to consume poisons without dying—actually binds her to a life of murder. This paradox is central to the novel’s exploration of power and corruption.

Conclusion

Ungu and Heroti are more than plot devices in Five Broken Blades. They crystallize the novel’s core questions: Can a person forged into a weapon ever be free? How does one bear the weight of being deadly? Through these poisons, Mai Corland gives readers a tangible symbol of hidden lethality—the disenfranchised who must use every part of themselves to survive—and the unspeakable cost of coercion.

For further reading on Sora’s character, see the character analysis of Sora. For more on the novel’s symbolism, return to the book main page.