Mechanicum

The automaton followed behind him, oblivious to the momentous role its master was about to play in the future history of Mars. The Fabricator General turned his hooded head to face Regulus, the adept moving with a loping mechanical grace as they delved into the depths of the planet and towards their destiny:

The Vaults of Moravec.

Secrets that could not even be imagined awaited within that forgotten repository - a wealth of knowledge that had lain untapped and unexamined for a millennium. Such a waste of resource. Such a crime to disavow the legacy of the past.

A gaggle of floating servo-skulls accompanied them, swaying lumen globes held in pincer callipers hanging from their jaws.

Dust billowed in their wake and the metallic ring of their footsteps echoed from the dry, flaking walls as they travelled ever onwards. Regulus turned another corner, taking them through an echoing chamber with numerous tunnels branching off into the unknown.

Without pause, Regulus chose the seventh tunnel along the western wall and led them onwards, past dusty tombs, empty cells and bone-stacked alcoves of unknown worthies who had died and been placed in empty reliquaries in ages past.

They passed open chambers piled high with dust-covered books, forgotten volumes of lore and chained bookcases of ledgers, records and the personal logs of long-dead adepts. Kelbor-Hal saw open caverns with giant machines, seized solid with rust or so corroded as to be unrecognisable.

This was the legacy of leaving technology untapped, the only possible outcome of the Emperor's decree that the Vault of Moravec remain unopened. With each sight, he grew more and more convinced that this path was the right one, that this gift of Horus Lupercal was one that should be accepted.

Kelbor-Hal's positioning matrix informed him that he was precisely nine hundred and thirty-five metres beneath the surface of Mars. He traced their route on a glowing map projected before him and recorded every step of the journey on a memory coil buried deep in his lumbar region.

It galled the Fabricator General that he needed Regulus to guide him through the maze, for he had travelled this way once before and should have been able to retrieve the route from his internal records.

It had been two hundred years ago when Kelbor-Hal had last seen the vault of Moravec. Together with his golden-armoured Custodians, the Emperor had led the way into the dusty sepulchres beneath Olympus Mons. The Emperor followed the path through the maze of tunnels towards the lost vault, though how the ruler of Terra had known its location had never been satisfactorily explained.

Nor had the need that had driven him to find the vaults been expressed.

Kelbor-Hal had put aside such concerns, eagerly anticipating studying the unknown technologies that lay within the hidden catacombs beneath Olympus Mons.

When the vault was located, however, the Emperor simply stood before it without opening it. He had placed his hand on the sealed entrance to the vault with his eyes closed, and stood as immobile as a statue for sixteen point one five minutes before turning and leading his warriors back to the surface, despite Kelbor-Hal's protests.

It had been forbidden to store any record of the path to Moravec's vault, though Kelbor-Hal had, of course, secretly activated his cartographic memory buffers. However, upon returning to the surface, he had found them to be empty of any record of the journey. As though it had never happened.

Nor could any remote telemetry or surveyor equipment sent into the tunnels locate the vaults. It was as though the vault had been removed from Mars, deliberately hidden from the very adepts charged with its safety.

The effrontery of the Emperor in tampering with a senior adept's augmetics was staggering, and Kelbor-Hal had angrily demanded the restoration of the data.

'The Mechanicum never deletes anything,' Kelbor-Hal said.

The Emperor had shaken his head. 'The vaults of Moravec must never be opened. You will swear this oath to me, Kelbor-Hal, or the union between Mars and Terra will be no more.'

Unwilling to even enter into any negotiation on the subject, the Emperor had demanded Kelbor-Hal's oath, and he had had no choice but to agree. That had been the end of the matter, and two days later the Emperor left Mars to begin his conquest of the galaxy.

All of which made this transgression all the more delicious.

It was a small thing to break the oath, for what manner of man would seek to prevent the organisation charged with the maintenance of technology from learning secrets of the past that might unlock future glories? To deny a thing its purpose for existence went against all laws of nature and machine, and, by such rationale, logic dictated that the Vaults of Moravec must be opened.

'We are here,' said Regulus, and Kelbor-Hal spooled out of his memories and into the present.