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At the age of thirteen, Elsie built a Sparrow with the help of her younger sister Ana for reasons she could not remember. This Sparrow would later become a production model, as the G-335 Anseris Overdrive.
Elsie designed at least two starships for Clovis Bray: the Eon Trespass and the Shadow Trespass. She completed work on the Eon Trespass three years before her disappearance, and attended the naming ceremony of the Shadow Trespass, which she designed with panels that helped it avoid detection by other ship's sensors.
Along with her sisters Willa and Ana, Elsie worked at the BrayTech Futurescape in the Hellas Basin on Mars. Although she primarily worked in weapons research and development, she assisted other BrayTech scientists working on the Sn0-armor project. After discovering Ana was working on a prototype line of scout rifles, Elsie looked over her work and was pleased by the progress her sister was making. She returned the rifle to Ana and told her that only she could finish the design.
Elsie's work with weapons led her to to discover that the test nodes used for gauging weapon effectiveness in field conditions could be easily configured for use as a locking mechanism that could be easily hidden in many places. She would later make use of her discovery to protect a project of hers inspired by a friend researching the Vex on Venus with the Ishtar Collective, which made use of a Vex Core to simulate alternate timelines for the purpose using the information gained to alter the original timeline. This project developed into the Worldline Zero sword, which allowed Elsie to see visions of the future. The concept of the weapon itself also piqued the interest of Willa, much to the horror of Elsie, who was concerned about the potential dangers should others obtain it. Elsie wiped the traces of her research, and hid the sword in a storage cache within the Core Terminus locked using the test nodes. She disappeared three days later, after leaving a message apologizing to Ana and asking that the Worldline Zero be used to "make things right."
Rebirth as an Exo
In the Mysterious Logbook, it is revealed that Elsie had fatal prion insomnia. She inherited this disease from her father, Clovis Bray II, who had developed this condition as a result of the genetic modifications done to him by his father, Clovis Bray I
Although initially reluctant, Elsie eventually uploaded herself into an Exo body, both to save herself and to reduce the risk of her own corruption by the Vex. She subsequently came to the rescue of her grandfather when he was being tortured by a copy of Maya Sundaresh, who had subverted the elder Bray's automated surgeon during a multi-organ transplant. In the aftermath, Elsie became obsessed with purging all other Vex influence on the Deep Stone Crypt staff, using non-destructive scans of their brains to map the progression of their Vex infections for excision via psychosurgery.
Afterwards, Elsie departed Europa to reconnect with her siblings and mother, causing much comment with her new Exo body. While she was away, Clovis I asked if she experienced the "Deep Stone Crypt" dreams common to Exos. Discovering that all Exos had these dreams enraged Elsie, who believed it indicated that all Exos were subverted by the Vex or worse. She secured a topological thought from the Jacob Hardy Trust and used it to construct a paracausal weapon capable of utterly destroying the Vex around 2082 Volantis before traveling back to Europa. Believing that this would compromise future Exo development and foreclose the future of humanity, Clovis I ordered his ship Hannu II to shoot her down as she descended to the surface, destroying her. However, he kept a backup of her initial upload scan, and reloaded her into a new exobody.
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