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**Sienna Astrid Helvig** (born c. 326) is an individual of the C9 universe, raised in the House of Confidence on Aerogaea 347n.

 

## Life

 

Sienna Astrid Helvig was born in about year 326.

She was 4 years old in 330, the year the Klak Grove was destroyed.

Twin; youngest in the group.

The manuscript records her across 6 passages, beginning in Chapter 1 — The Klak Grove.

 

## Mind

 

She does not have Celestine's twitch reactions. She processes data patiently, looking for the why behind the action. 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.

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.

 

## Body

 

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.

 

## Appearances

 

[[pages/glass-house-chapter-1-the-klak-grove|Chapter 1 — The Klak Grove]], [[pages/glass-house-chapter-11-the-poison|Chapter 11 — The Poison]], [[pages/glass-house-chapter-17-the-explosion|Chapter 17 — The Explosion]], [[pages/glass-house-chapter-2-the-glitch|Chapter 2 — The Glitch]], [[pages/glass-house-chapter-3-the-lab-and-the-threat|Chapter 3 — The Lab and the Threat]], [[pages/glass-house-chapter-5-the-first-of-senetis|Chapter 5 — The First of Senetis]].