Keeper-of-Tools

Keeper-of-Tools was a Forerunner Builder.

Path Kethona
Keeper was part of the Librarian's crew during the expedition to Path Kethona around 98,395 BCE. He was a young, ambitious Builder who was being groomed to move high in Forerunner society; this was suspected to be the reason he was chosen to be part of the crew of the Audacity. He devoutly attended the clandestine rituals of Builder secret societies, though he was still in the earlier phases of induction into their secrets.

After the first slipspace jump toward Path Kethona he noted that they had gone farther than any other Forerunner and praised the Audacity. He reacted to the presence of ancient Forerunner and Precursor artifacts within Path Kethona with great enthusiasm, taking this as evidence of cooperation between the two millions of years earlier.

Keeper-of-Tools did not accompany the Librarian planetside after the crew discovered a world home to primitive Forerunners who had been isolated from their brethren in the Milky Way for ten million years. After the Librarian had found out the truth of the origins of the local Forerunners, Audacity and her crew returned to the ecumene, although the Librarian would not reveal what she had discovered until much later.

Searching Bastion
One thousand years later, Keeper was one of the few Forerunners who survived the activation of the Halo Array. Soon embarking on a search for Bastion, he discovered that Bastion had been moved from its original location, a feat he believed would require "an impossible act of reconciliation" to perform. The Builder was desperate enough that he sought out a surviving durance and enlisted an ancilla to help him find a route to the Domain, where he hoped he could make it to Bastion. His search took him to Sanghelios at one point, where he believed he had found a route to Bastion. Instead, he arrived at Genesis, where he found that the Domain had been severely damaged by the Array, and was trapped there, degrading over time.

Surviving in Genesis' systems, Keeper witnessed the beginning of the alliance between Cortana and the Warden Eternal, and reacted with alarm as they took control of Guardians across the galaxy to enforce the Mantle of Responsibility. He noted, however, that the Domain had repaired itself enough to cure Cortana of her rampancy, and hoped to finally access it. Eventually, Cortana noticed his presence in her network and began to hunt him down, though Keeper left audio logs scattered across Genesis to warn the human forces who opposed her, noting that Cortana had not yet taken control of the installation's Constructors, and that the installation's monitor, Exuberant Witness, could use them to take back control.

As Cortana began to deploy her massed Guardian forces across the galaxy, and the Warden was distracted fighting both Blue Team and Fireteam Osiris, Keeper was able to finally access the Domain, restoring him and finally allowing him to locate Bastion.

List of appearances

 * Halo: Silentium
 * Halo 5: Guardians
 * Halo: Point of Light