Unidentified Builder

This Unidentified Builder is a Forerunner Builder who survived the firing of the Halo Array and searched for Bastion on the Genesis installation.

Biography
Through unknown means, he managed to survive the firing of the Halo Array and recounted the disappearance of the Domain. After the firing, he began to search for a facility called Bastion. During his search, he traveled to Sanghelios and later Genesis, where he became trapped.

Surviving on Genesis until 2557, he witnessed the alliance between the human AI Cortana and the Warden Eternal, as well as the ancilla's use of the Guardians. Soon, Cortana learned about his existence and went after him. The Builder was able to escape from Cortana, and managed to enter the Domain, where he finally discovered Bastion's location.

List of appearances

 * Halo 5: Guardians