Lifeworker

A Lifeworker is a Forerunner occupation tasked with experimenting with new forms of life. Earth was at one point an "experimental planet" under the care of a Lifeworker. Bornstellar Makes Eternal Lasting encountered a Lifeworker on Earth during his tenure as a Miner.

Trivia

 * It is possible that the Librarian was a Lifeworker, as she was involved in studying and categorizing sentient life across the Milky Way.

List of appearances

 * The Forerunner Saga
 * Halo: Cryptum