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**Sienna Astrid Helvig** (born c. 326) is a figure of the C9 universe, recorded as homo sapiens (lyall-helvig chimera)[1], raised in the House of Confidence on Aerogaea 347n[2]. She came out of future timeline (~350) and post-collapse sector[1].

Sienna is recorded for bio-organic manipulation (self & others)[1]. Her skin is her epidermal layer can secrete a malleable polymer — synthetic skin. She can mold this over her own features or others to create disguises. It feels like skin but acts like a seal. She wears faces to survive the environment: if she looks like a soldier, they respect her; if she looks like a Voidomorphian, they do not attack her. She does not heal magically — she redistributes. To knit a broken bone in Celestine, her own femur decalcifies to supply the material. To filter poison from Akio, she pulls the toxin into her own liver and processes it, getting sick in the process. She is a living transfer system. Healing is not pretty. It is a transfer of suffering. She radiates a low-level calming field — pheromone output — that lowers the heart rate of people around her. Passive. She cannot turn it off.[1]

The record follows her across 3 periods of life, from year 330 onward[1]. In the last of them she is recorded as xeno-diplomat.

Sienna appears in 7 of the 19 chapters written so far, beginning with Glass House chapter 1[3].

## Early life

Sienna Astrid Helvig was born in about year 326[2]. She was 4 years old in 330, the year the Klak Grove was destroyed. She is twin; youngest in the group. The records give her origin as future timeline (~350) / post-collapse sector[1]. Her development is recorded as symbiotic maturation (thrives when connected to a group/pack)[1].

## Celly’s anchor (330–339)

Her standing at this time was celestine’s anchor / the "good" twin. Physically, 135cm. Always neat, hair in a chignon, wearing polka dots. She looks harmless, which is her primary defense. What defines her in this period is Celestine. Sienna cleans up the mess Celestine makes.[1]

## Infiltration specialist (340–349)

Her standing at this time was infiltration specialist / spy. Physically, she is rarely seen in her own face. She wears the "Synthetic Skin" masks to walk among enemies or gather intel. Her true face is a secret shared only with the family. What defines her in this period is she begins making unauthorized contact with the enemy, realizing they are sentient.[1]

## Later years (350 onward)

 

Physically, she stops wearing masks. She stands openly between the Human armies and the Voidomorphians. What defines her in this period is forcing humanity to forgive the monsters.[1]

 

## Abilities

 

The mechanism on record is bio-organic manipulation (self & others)[1].

 

The effect answers to touch. Both healing and disguise generation require physical contact. You cannot create life from nothing. To heal a wound, she must give her own vitality. Extensive healing leaves her bedridden, anemic, and gray. She is understanding the enemy makes it impossible to kill them. She hesitates when others strike.[1]

 

### Novice

 

She can heal minor cuts/bruises. Disguises are crude (like putty) and melt after a few hours. Telepathy is just "feelings" (scared/angry).[1]

 

### Mastery

 

She can knit complex organ damage (at high cost). Disguises are flawless, pore-perfect replicas lasting 48 hours. Telepathy becomes clear conversation with non-humans.[1]

 

### Decline/Shift

 

Physical healing weakens, but her mental reach expands. She can link the minds of a group to share pain/thoughts, acting as a "Psychic Router.".[1]

 

## Character

 

Her perception runs she does not have Celestine's twitch reactions. She processes data patiently, looking for the why behind the action. The record notes geologic patience for negotiation. Forced open. She cannot turn off the data stream of others. She senses adrenaline, pheromones, and pain instantly — not metaphorically, biologically. The cost of it is crowds are physically painful. She gravitates toward Marcus because his pain gate is welded shut — he is the only quiet room she has. To her, he feels like silence. She connects behavioral dots. The creature attacks when the wind blows north → it is protecting a nest → we should move south. When her empathy is running high, she subconsciously mimics the body language and micro-expressions of whoever she is talking to. It is not a conscious tactic. It establishes trust anyway.[1]

 

Early in life she held to a lie about herself: "If I follow the rules and stay clean, the chaos can't touch me." / “If I am quiet enough, I can keep the peace.”. Later she came to hold the opposite: "Peace is a dirty job.”. As a young woman, her voice was polite, soft, mediating. The record notes "Maybe they didn't mean it?". The record notes ​Prime: Tired, cynical, sharp. "I don't care who started it. I'm finishing it. The record notes sit down.". The record notes ​Elder: Warm, absolute. A voice that stops armies.This is a great addition. Sam is the definition of a "Glass Cannon"—high damage, high instability.[1]

 

Sienna is present in 7 of the 19 chapters written so far.

 

- [[pages/glass-house-chapter-1|Glass House chapter 1]] — Sienna had come with tea — she made it the way she did most things, with more attention than the task seemed to require, and the result was always better than it had any right to be.[3]

- [[pages/glass-house-chapter-2|Glass House chapter 2]] — The kitchen smelled like warming food and the oil Sienna put in the pan for the eggs, which was a specific kind of oil that she'd brought from somewhere and never told them where.[4]

- [[pages/glass-house-chapter-3|Glass House chapter 3]] — Sienna and Celestine were forty meters away, running circles in the grass, completely unconcerned with the arrival of fifty armed men.[5]

- [[pages/glass-house-chapter-5|Glass House chapter 5]][6]

- [[pages/glass-house-chapter-11|Glass House chapter 11]] — Sienna looked at the scanner at the end of the corridor.[7]

- [[pages/glass-house-chapter-13|Glass House chapter 13]][8]

- [[pages/glass-house-chapter-17|Glass House chapter 17]] — Sienna had noticed and had been sitting beside since they arrived.[9]

 

## References

 

1. Character dossier, *Sienna.md*, C9 archive

2. Register of births, *Generations.md*, C9 archive

3. [[pages/glass-house-chapter-1|Glass House chapter 1, C9 manuscript]]

4. [[pages/glass-house-chapter-2|Glass House chapter 2, C9 manuscript]]

5. [[pages/glass-house-chapter-3|Glass House chapter 3, C9 manuscript]]

6. [[pages/glass-house-chapter-5|Glass House chapter 5, C9 manuscript]]

7. [[pages/glass-house-chapter-11|Glass House chapter 11, C9 manuscript]]

8. [[pages/glass-house-chapter-13|Glass House chapter 13, C9 manuscript]]

9. [[pages/glass-house-chapter-17|Glass House chapter 17, C9 manuscript]]