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· Many believe the Thousand Sons always wore mystical blue armor, but before the Horus Heresy, they actually wore red armor with gold trim.
· Red symbolized the Thousand Sons' warfare and Primarch Magnus's pursuit of knowledge, psychic power, and the Warp.
· After the Rubric of Ahriman, the Thousand Sons' souls were burned to ash and trapped within their armor, gradually leading them to adopt blue and gold armor, signifying Tzeententch's influence and their new identity as a Chaos Legion.

· Space Marines are not immortal beings; they do age over time. However, their aging process is incredibly slow.
· Thanks to specialized organs implanted during the Astartes transformation, their bodies can regenerate and be maintained for hundreds, even over a thousand years.
· Chapter Master Dante of the Blood Angels is one of the oldest Space Marines, having lived for over 1,500 years, feeling the fatigue of age but continuing his duties.
· Most Space Marines fall in battle before dying of old age, which often leads to the misconception that they are immortal.

· In fan art and games, Space Marines are often depicted as giants reaching 2.7-3m, but in official lore, they are not quite that tall.
· A typical Astartes is about 2.1-2.3m without armor, and only appears larger when wearing Power Armor.
· Primaris Space Marines, a new warrior class introduced in the Indomitus Crusade, are 2.4-2.6m, taller than their older generation counterparts, but still smaller than popular perception.
· Exaggerated depictions often lead to the misconception that Space Marines are much larger than they actually are.

· The Imperium maintains a strict policy of concealing the true nature of Chaos from most civilians, as well as many military organizations.
· Space Marines are taught only that Chaos is an enemy to be destroyed, as knowing too much about Chaos and the Warp can lead to corruption.
· They are aware of heretics, daemons, and traitors, but are not explicitly informed about the true nature of entities like Khorne, Nurgle, Tzeentch, and Slaanesh.
· Only specialized units, such as the Grey Knights of the Ordo Malleus or Inquisitors, are trained to understand and confront Chaos at its deepest levels.
· Some Chapters even completely forbid the study of Chaos, believing that knowledge can be more dangerous than any weapon.

· After the Second Founding, the massive Legions of the Horus Heresy era were divided into hundreds of independent Chapters to prevent a large Space Marine force from rebelling again.
· Over millennia of warfare, migrations, and reorganizations, much crucial data was lost or deleted, and sometimes intentionally hidden.
· Some Chapters have completely lost their genetic records regarding which Primarch's geneseed they were created from.
· The Imperium also intentionally conceals the origins of Chapters linked to sensitive historical secrets.
· The Braven Chapter is known for its unusually high number of Librarians and obsession with ancient knowledge, yet no one definitively knows which Legion they originated from.

· This may sound like a barbaric legend, but it's a fact stemming from a specialized organ called the 'Omophagea' implanted during the Astartes transformation.
· The Omophagea, also known as the 'memory brain organ,' allows Space Marines to extract memories or information by analyzing residual bio-signatures when they consume parts of other living beings, especially brain and neural tissue.
· In warfare, this ability provides an incredible advantage. Space Marines can consume parts of an enemy's brain to quickly understand languages, tactics, terrain, and military plans.
· Some Chapters even incorporate this into their combat rituals or traditions. This demonstrates that Space Marines are not merely warriors with enhanced physical strength, but beings designed to wage war in ways unimaginable to ordinary humans.

· The Astartes body possesses a specialized organ called the 'Catalepsean Node,' which allows them to uniquely control the brain's resting state.
· While human sleep involves the entire brain temporarily ceasing activity to recover, Space Marines can periodically switch off and on different parts of their brain.
· This means that while half of the brain rests, the other half can remain fully awake and alert.
· Thanks to this ability, Space Marines can stay awake for extremely long periods, maintaining patrols, battlefield observation, and defensive postures for days without conventional sleep.
· During long operations, only short periods of rest are needed for each part of the brain to gradually recover. These implanted organs transform Space Marines into warriors who transcend human biological limits, making even sleep a tool for war.

· The Codex Astartes is not an absolute, mandatory law. Many Chapters regard it merely as a tactical guideline, not a set of rules to be strictly followed.
· A prime example is the Black Templars. This Chapter largely disregards the 1,000 Space Marine limit.
· Instead of maintaining a fixed force, they disperse their forces into numerous Crusade fleets that roam across the galaxy, waging endless holy wars.
· Due to this decentralized structure, the Black Templars' total strength is known to be far greater than the regulations stipulated in the Codex.
· Because their forces are constantly on the move, fighting in various regions of the galaxy, the Imperium finds it difficult to accurately control the true size of this Chapter.
· This demonstrates that even fundamental rules like the Codex Astartes are not absolutely applied to some Chapters within the Imperium. For them, their traditions and beliefs are more important than any tactical manual.

· Many believe that Space Marines are absolutely loyal to the Imperium, serving the Empire as perfect warriors without doubt or rebellion.
· In reality, however, not all Chapters fully trust the Imperium's power structure.
· Some Space Marines are loyal to the Emperor but do not necessarily believe they must obey every decision made by organizations like the Adeptus Mechanicus, Ecclesiarchy, or Inquisition.
· The Space Wolves Chapter possesses a tribal warrior culture and strong independence. They consider themselves sons of Primarch Leman Russ before being soldiers of the Imperium.
· Tensions between the Space Wolves and the Imperium erupted into serious conflict after the Second War for Armageddon. When the Inquisition sought to exterminate those who had come into contact with daemons to preserve the secrets of Chaos, the Space Wolves protected them, directly clashing with Inquisition forces.
· This demonstrates that Space Marine loyalty sometimes focuses more on the Emperor and the Chapter's honor, and if it conflicts with the Imperial power system, not all Chapters will side with the Imperium.

· Many believe that Primarchs had a strong bond with their Legions, viewing the Space Marines created from their geneseed as loyal sons.
· However, this isn't true for all Primarchs. Angron, the Primarch of the World Eaters, is a prime example.
· Unlike his brothers, Angron failed to form a true bond with his Legion.
· Before being discovered by the Imperium, Angron lived as a gladiator slave on Nuceria, fighting alongside his fellow gladiators. These were Angron's true family.
· However, the Emperor took Angron from the planet without saving his fellow gladiators, who met their demise in a desperate rebellion.
· From that moment, Angron harbored deep rage and hatred. He did not see the World Eaters Space Marines, created from his geneseed, as sons or comrades.
· In Angron's eyes, they were merely artificial replicas, incomparable to the comrades who fought and died with him.
· This detachment contributed to the World Eaters becoming an increasingly brutal Legion, and the relationship between the Primarch and his warriors was built not on loyalty, but on endless rage and violence.