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The father of Bornstellar-Makes-Eternal-Lasting was a powerful Forerunner Builder. He and his guild designed the Halo Array under the orders of the Master Builder. Standing four meters tall after his most recent mutation, Bornstellar noted that he bore a disturbing resemblance to the Master Builder.
Though he had many children, Bornstellar was the most rebellious of them all, refusing to undergo the intensive training and education expected of him. Bornstellar's rebellion eventually led his father to send him to a step-family of Miners on Edom, where his father hoped he would learn discipline. Eventually, however, Bornstellar escaped to Erde-Tyrene and ended up traveling across the galaxy with the Ur-Didact, until he was caught by the Master Builder and sent back to his family. Some time after Bornstellar's return, his father met with another Builder and learned that the Master Builder had used a Halo against the San'Shyuum and would be tried for violation against the Mantle as a result. This would also result in him and his guild being indicted for designing the Halo weapon.
The next morning, Bornstellar confronted his family, bearing a message from the Didact about the Halo tested at Charum Hakkor. Bornstellar's father was hesitant to discuss the Halos openly at first, but eventually revealed that Bornstellar's presence was requested at the Master Builder's trial. Before Bornstellar departed, he met with his father who, despite being saddened to see his son taken from his family, told him that he placed all his hope in his son.
- Halo: Cryptum (First appearance)