Halo Waypoint provided a glossary of nouns used in Halo: Cryptum over a week to make sure readers understood the meaning of the words used in the novel.
Supreme Mantle Court - a rare holding of the court by the Council to discuss matters of extreme importance and significance.
Phylarch of Builders - A leader within the Builder rate who was particularly notorious for his role in reinstating the Warrior-Servants in response to a great threat
The Capital - The centre of the Forerunner ecumene, a repository of twenty thousand years of Forerunner knowledge and wisdom which housed trillions of ancilla and served as home to roughly one hundred thousand Forerunners, mostly Builders high of rate and the Council.
The Metarchy- An unimaginably vast network used by ancilla, ultimately coordinated by a single metarch-level intelligence who reports directly to the chief councilor.
Mendicant Bias - A tremendously powerful Contender-class ancilla designed to coordinate control of the Halo installations under authorization of the Council and the Master Builder.
Plasma jockey - A colloquial term by Builders for stellar-class Engineers equipped with third-class ancilla, their role is to tame young stars for future use.
Ghibalb - The natal Forerunner planet, once a beautiful paradise, now a desolate and radiation-scortched cinder due to early Forerunner mistakes in stellar engineering.
Master Builder - A title given to the chief of the Builder rate and of all the guilds; considered to be the most powerful Forerunner throughout all the Ecumene.
Pheru - A highly-valued human pet which originally came from the planet of Faun Hakkor.
Huragok - Techno-organic Builder servant-tools which float above the ground.
Mutations - The careful act of customized biological maturation of a Forerunner to new forms and/or rates which is typically performed between two to five times over the course of a lifetime. The process determines a Forerunner's place within his or her family, Maniple or guild and is always patterned after the mutation's mentor, typically but not always one's parent.
Brevet mutations - Risky, ad-hoc mutations which can be successful, like traditional mutations, but can often introduce complications since they are less practiced and honed.
Kasna - An intoxicating green San'Shyuum beverage.
Builder Security - Forerunners of the Builder rate who conduct secutity and combat matters for the Builders.
Janjur Qom - A primary-treaty planet and the largest of the San'Shyuum quarantine worlds.
Builders - The highest and most powerful rate among Forerunners, led by the Master Builder.
The Council - A collection of at least five hundred representatives from various Forerunner rates across the ecumene.
San'Shyuum - A peaceful species, interested in their own betterment through science. Noted for their profound sensuality.
Halo - An enormous ring-shaped, wide-effect neural-disruption weapon considered to be the final defense against the Flood.
The Confirmer - An aged Promethian commander assigned by the Council to guard and protect the San'Shyuum.
The Timeless One - A mysterious creature which was once held within the arena of Charum Hakkor.
Faun Hakkor - A neighboring planet to Charum Hakkor and one which the humans had once occupied.
Ben Nauk - A neighboring planet to Charum Hakkor and Faul Hakkor, also occupied by the humans.
Geas - A generations-long genetic command which can nudge or persuade individuals or generations into a planned destiny.
Prometheans - A noble class of Warrior-Servant Forerunner rate from the distant past.
Cryptum - Also referred to as a "Warrior Keep", a sealed structure where a Warrior-Servant would enter a self-imposed exile, hibernating in a meditative state of contemplative transcendence called "timeless xankara."
Synchrons - A nexus of great forces and personalities; a point when one's life dramatically changes.
Digon - An ancient language used almost exclusively by Warrior-Servants.