Throne Mechanicum - Role: A Knight suit is a potent and deadly weapon, but without its Noble pilot it is a hollow shell. The Human component in the core of every Knight suit is its heart and mind both, a man or woman bestowed with the martial might of a demigod. The process of bonding with a Knight is a dangerous one, however, an apotheosis that not every aspirant survives. Knight suits are ancient machines, with complex and often belligerent Machine Spirits (artificial intelligences) to match, and only the worthy may break such a beast to their will.Knights are controlled in a similar fashion to the great engines of the Titan Legions, through mind impulse control links that allow the pilot to wear their Knight suit like a second skin. Indeed, the fluid direction that a Noble has over his Knight allows an ease of movement bettered only by the alien war engines of the Aeldari. However, where the princeps of a Titan will often inhabit an amniotic tank or be cybernetically and permanently bound to their god-engine's bridge, the Nobles who pilot Knight suits interface with their towering machines through the device known as the "Throne Mechanicum."Additionally, every Knight possesses manual controls, which include dials and switches, a throttle lever for the right hand, and a fire-control stick for the left. If the Knight makes use of a melee weapon, its control stick lies just ahead and to the right of the throttle. These controls exist mostly for the use of the Knights' Sacristans and are intended to allow these technicians to position the suit in maintenance bays, run simulations or to move it over short distances. The reality is that these manual controls allow for only rudimentary and clumsy movements and as such are far inferior to the use of the Throne Mechanicum.However, if a Noble was ever rendered "thought-dead" -- a term for the termination of the mental connection between the Noble and their Knight's Throne Mechanicum -- they could rely in such an emergency on their manual controls. While their Knight would become slow and stilted, more like an Astra Militarum Sentinel walker than a true fusion of Human consciousness and archeotech, manual control might be enough to save the pilot's life.At the heart of every knightly stronghold is a single, ancient, massive building known simply as "the Sanctuary." It is here that the suits of Knight armour are stored when not in use and where the Nobles undergo the ancient rituals and procedures that allow them to bond with their Thrones Mechanicum. These Sanctuaries are incredibly ancient structures, built when the original human Long March colony ships first landed on the Knight Worlds during the Age of Technology. The essential functions of the Sanctuaries also originate from that time, though the changes and modifications made to the equipment over the millennia mean it would be unrecognisable to those that first installed it.It is in the Sanctuary that young Nobles undergo the bonding process that imprints their personality into a Throne Mechanicum, in a procedure known as the "Ritual of Becoming." This process takes place in a special room called the Chamber of Echoes. The imprinting process is a lengthy, sometimes dangerous, business. It has become a rite of passage for young Nobles -- the process of leaving behind their childhood once and for all. When he is old enough, a son of the household who is designated to become a Noble is fitted with the sacred neural sockets and then undertakes a vigil, remaining seated in the Throne Mechanicum that has been assigned to him throughout a long night in the Chamber of Echoes.The nature of this ordeal, and the inherent dangers associated with the neural interfacing process, mean that more than a tenth of all supplicants are either driven mad by the process or suffer fatal aneurysms brought about by neurological feedback. Assuming it is successful, the imprinting process has two important side-effects. Firstly, the imprint tends to exaggerate dominant aspects of the young Noble's personality, especially with regard to the emotions they are feeling during their vigil. If they are scared, the imprint on the Throne will always be of a nervous tendency, making the suit difficult for them to control in combat.If the Noble is angry with someone, the imprint will always loathe that person, even if the Noble theselves has long since forgiven or forgotten them. When a Noble dies, their Throne Mechanicum's artificial intelligence retains some of their personality and character, and these electronic "ghosts" whisper to each supplicant through the long vigil in the Chamber of Echoes.However, in addition to imprinting the Noble's personality upon the Throne Mechanicum, the mind-link technology directly affects the personality of the Noble themselves. It does this by implanting strong positive associations to notions of fealty, obligation and societal hierarchy, as well as a deep and almost mystical respect for the Noble's ancestors. Exactly why and how these things are made to happen is something of a mystery, but it seems most likely that the mind-altering feedback routines were intentionally included by the device's original designers to limit the potential of a Noble to go rogue and turn on the people they were meant to protect.Once a Throne Mechanicum has been imprinted, it is stored in the Communion Dome, which lies atop each Sanctuary. This chamber is large and circular, with walls that are lined with all the Thrones Mechanicum of the household's Nobles. When a Noble wishes to interface with their suit of Knight armour, they sit upon their Throne and instigate the "Protocols of Joining."Umbilical cords attach themselves to the Noble's neural sockets, and then a section of wall behind the throne yawns open. The Throne Mechanicum slides backwards, and descends from the Communion Dome through a series of transport tunnels, before finally sliding into the waiting cockpit of the Noble's suit of Knight armour. This final step in the process takes place in a massive hangar known as the "Vault Transcendent," which forms the ground floor of the Sanctuary. This huge hall is large enough to hold all of the stronghold's Knights. As soon as Noble, Throne and Knight armour are united, the three become as one, and the Imperial Knight powers into life. Vast doors open in the outer walls of the Sanctuary, and the Knight strides forth to battle.The link between a Throne Mechancium and its Knight suit is a strong bond formed in the fires of war down through the centuries of constant warfare. In some instances, when a pilot is slain, it is not unheard of for a Knight suit's Throne Mechanicum to take automatic control of the walker in the midst of combat.In one of the most famous instances, this occurred in 854.M40, when a trio of Knights from House Krast joined the Space Marines from the Ultramarines Chapter to defend the Mining World of Gorvax against a host of Craftworld Aeldari Ghost Warriors from Iyanden Craftworld. A Knight suit's Throne Mechanicum took control after its pilot was slain by a xenos sniper, and the echoes of spirits long dead guided the unmanned Knight into battle once more. The Knight carved its way through countless wraithbone constructs before two Wraithknights, the largest and mightiest of the xenos combat walkers, finally brought it down in an epic duel of giant war machines. Though the Aeldari were eventually defeated, victory on Gorvax did not belong to the living.