Unidentified Builder

This Unindentfied Builder is a Forerunner Builder who was alive in Genesis.

Biography
He, somehow, managed to survive the firing of the Halo Array and account the disappearance of the Domain. After the firing, he began to search someone called "Bastion". During his search, he travelled to Sanghelios and Genesis, where he became trapped.

He manage to survived until 2557, he witness the alliance between the human AI Cortana and the Warden Eternal, how the ancilla called the Guardians and her repairing in the Domain. Soon, Cortana learned about his existence and chased him. The Builder was able to escape from Cortana, and manage to enter in the Domain, where he finally discovered Bastion's location.

List of appearances

 * Halo 5: Guardians