Standard Template Construct (STC) - M40-M41: Unknown Date.M40 - The STC template for improved jet engines was discovered by the Dark Angels while hunting a suspected Fallen Angel known as Baelor the Imposter in the Nephilim Sector. Designated the "Lionheart Engine," the technology was used to modify older aircraft designs and the end product was an agile aircraft with improved speed called the Nephilim Jetfighter. This vehicle is still exclusive to the Dark Angels and their Unforgiven Successor Chapters. The Dark Angels also possess an STC database containing the designs for weapons known as Rift Bombs that can cause fluctuations in space and time. When faced with an inquiry by the Adeptus Mechanicus amid allegations that the Chapter had illegally hoarded lost technology in contravention of Imperial law that requires all recovered technology to be handed over to the Mechanicus, the Dark Angels adamantly denied possessing STC databases of any kind.Prior to 775.M41 - An STC database template for a Combat Knife was discovered by two Astra Militarum scouts that proved "sharper and lighter and tougher" than previous designs. They were hailed as heroes by the Imperium for this discovery, and were each rewarded with being raised to the Imperial nobility and made planetary governors. The new Combat Knife design was adopted by 30 Chapters of the Adeptus Astartes.755 - 778.M41 - An STC template was found by Colonel-Commissar Ibram Gaunt on the world of Menazoid Epsilon during the Sabbat Worlds Crusade. The full abilities of the device were never made clear, but it is known that the device could make the actual objects (constructs) corresponding to a standard template, rather than producing just the designs. In this case, it made the legendary "Men of Iron"; robotic soldiers and labourers that were considered heretical in the Imperium because they possessed true artificial general intelligence, but it is possible that the STC Constructor also held and/or could create other STC designs. However, the device had been tainted by the power of Chaos and the robots it produced were misshapen monstrosities that attacked Humans on sight. To prevent the use of these robots, Gaunt destroyed the device.992.M41 - The STCs outlining the design for most of the Astraeus Super-heavy Tank were recovered by Minotaurs Chapter Astartes during the Perun Cross Incident.Unknown Date.M41 - Less than 500 standard years before the events on the Ark Mechanicus Speranza (see below) Magos Phlogiston discovered a nearly complete STC design for a certain pattern of Titan-class Plasma Reactor kick-starter. The kick-starter was designed to bring the reactor up to full power in the shortest time possible. Among the missing data-fragments were components needed to prevent the kick-starter from driving the reactor into uncontrolled critical mass. Due to this, the designs were archived, instead of being put into production.Unknown Date.M41 - Magos Ozimandian unlocked the STC engine fragment of Beta Umojas. This led to a 5% paradigm shift.Unknown Date.M41 - While connected to the Machine Spirit (artificial intelligence) of the Ark Mechanicus Speranza, Archmagos Lexell Kotov discovered that the ship contained a complete and still updating STC database containing all the knowledge of the Men of Gold and their ancestors. He theorized that all Ark Mechanicus ships contained such a database, but that the Priesthood of Mars had been unable to access the files. This information was wiped from his mind upon disconnecting from the ship's Machine Spirit.Unknown Date.M41 - A large cogitator-stored STC Library was located on the planet Hito. This world had escaped from the Warp and was reclaimed by the Imperium. The library was hidden by the local clerical Order of Heavenly Virtues who managed to deceive Imperial agents as to the library's existence to keep its secrets out of the Imperium's hands. Instead, they shared a number of physical printouts of the designs kept within the archive with the Adeptus Mechanicus, claiming it was all they still possessed.Unknown Date.M41 - A rare STC template known as "Panacea," containing the cures for several types of common diseases and toxins, was unearthed by the Forge World Verdigris IX. Despite the Verdigris Mechanicus' best efforts to protect it, it was stolen by a Drukhari named Aurelia Malys and her Kabal during the Panacea Wars.Unknown Date.M41 - The STC for the Lion Pattern Boltgun and the  "Inferno" Pattern Avenger was discovered aboard the space hulk Olethros by a Dark Angels Terminator squad. It was found in the fused wreckage of a pre-Heresy Dark Angels warship called the Caliban's Will. Lesser STC fragments were also recovered, such as those for an industrial plasma cooler, a bunker, and a military cot. STC fragments for Mark IV Maximus Power Armour and an Arc Rifle were also recovered from throughout the space hulk.Unknown Date.M41 - The STC schematics for a "Geller Device" or "Empyeral Bomb" was developed on the Forge World Velchanos Magna and deployed in an attempt to combat a nearby Warp Storm. Unfortunately the device caused the Warp Storm to envelop the planet instead and it was declared lost in the Empyrean for many Terran centuries. The problem was that the Gellar Device did not only clear away the storm but the effect travelled back along the closest path through the Warp to the detonation point, usually that of the voidship which deployed the device. Because of this, the device had only been deployed twice, and had resulted in the loss of both the Forge Worlds Satzica Secundus and Velchanos Magna to the Warp. The STC database for this item was rediscovered by Magos-Explorator Omnid Torquora in the wreckage of the starship Stella-Xenithica. In reality, the ancient STC had been planted in the derelict voidship as a trap by the Iron Warriors, in a ploy to capture both lost Forge Worlds. Omnid destroyed all of the copies of the database due to it causing the destruction of two entire Forge Worlds and the countless Adeptus Mechanicus forces upon them.Unknown Date.M41 - The STC fragment for a type of paint, provisionally known as Substance 145XX22, was rediscovered by a combined force of Skitarii and Astra Militarum. The paint possessed a unique chemical composition that allowed for the painting of wargear to be completed in a much shorter time. While the Skitarii suffered heavy causalities in recovering the STC, it was secured for the Imperium by Commissar Trast. The discovery of this STC fragment caused rebellion on several Hive Worlds responsible for painting vehicles and forced the Imperium to enact a full compliance action upon the citizens of the pigment-wells of Agrax. Due to this revolt, the STC was suspected of being somehow corrupted by Chaos. The STC took several hundred standard years to be declared uncorrupted and fully sanctioned by the Senatorum Imperialis. For securing the STC, Commissar Trast was rewarded with a governorship over a low-level Agri-world and the naming rights for Substance 145XX22. Unfortunately, as it took several hundred years for the STC to be fully sanctioned, it is unlikely that Commissar Trast survived long enough to receive the reward.998.M41 - An artefact called the Omnicopaeia was sought after by Magos Delphan Gruss. This device was believed to be a data storage mechanism that contained every STC schematic created during the Dark Age of Technology. Its existence became known after Delphan Gruss examined numerous STC legends; he has since devoted his life to finding the artefact. In 998.M41, rumors erupted across the Imperium that the Omnicopaeia lay on the Daemon World of Hell's Teeth in the Maelstrom. Due to the immeasurable value of the device, the Adeptus Mechanicus mobilised billions of Skitarii for the reclamation operation.999.M41 - An original STC template for a new Battle Titan, a so-called Castigator-class autonomous bipedal weapons platform, created for fire support and siege operations, was discovered on the planet Chaeroneia by a team of Grey Knights led by Justicar Alaric investigating that long-overrun Imperial Forge World . It was much larger than an Imperator-class Emperor Titan and made use of superior technology. The STC was also discovered on that world, but was unfortunately destroyed by the Grey Knights as it had become corrupted by the forces of Chaos.