10 things you didn't know about space marines

Space Marines are the backbone of the Imperium's military in this region Warhammer 40K The Cosmos Space Marines are genetically enhanced humans who essentially leave their humanity behind to evolve into something greater to serve the Emperor and the Empire.




The life of a space marine is one of eternal service and war, going from one battlefield to another in the grim darkness of the distant future. Having such a core component of the Imperium makes their basics well known. But here are some lesser known facts about Space Marines.

10 Become a space marine

Few are chosen, fewer make it

Three Space Marine Salamanders stand in a spinning inferno of their own making

  • Many children die or go insane from the experiments.
  • It has a shelf life of approximately 8 to 10 years.

The exact process of becoming a Space Marine varies from season to season, though some common factors are what age the process starts and what these newbies have to go through. In the larger episode, a 10-12-year-old boy is selected to become a space marine and begins his experiments, training, and training immediately. Some chapters even go as far as holding babies.


Once selected, the next few years involve many surgeries, hypnotherapy, and mental and physical training to transform them both mentally and physically into a Space Marine. Each step of the process is difficult, and only a small percentage of those who make it through survive to become a Space Marine.

9 Looking down on humans

are interchangeable

7 line game that looks like an open world, Titus fights Tyranids with Cadins

  • Few chapters value human life.
  • Some chapters just randomly kill humans in battle without thinking.

A Space Marine's goal is to defeat the Imperium's enemies and follow the Emperor's orders no matter what. This often results in the Space Marines not caring about the lives of those around them outside of the Battle-Brothers.


While the Space Wars are fought alongside many other factions of the Imperium, many chapters don't really care about those humans or those in the Imperium, instead seeing them as lesser beings that have a function for the Imperium but are interchangeable with other ordinary humans. .

8 They spit acid

A hidden tool

A Black Templar raises his sword into the air with the breaking sun behind him

  • Some Gene-Seeds disable this mutation.
  • A stationary weapon is not reliable in battle.

One of the organs surgically added to a space marine is the Betcher's Gland. This turns the Space Marines' saliva into a powerful acid that can break down almost any substance.


Compared to other Space Marine weapons, this extra ability is more for useful use in breaking down and digesting things that might be dangerous to consume, or to escape from a dangerous situation where they were unarmed. Over time, this tube has also become unusable for many seasons and is not often used by Space Marines.

7 Functionally timeless

Age is no longer an issue

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  • The studs in their heads represent several centuries of service.
  • Most of them live longer than an average human life.

Given all the changes a Space Marine has, they are functionally immortal, and once they reach adulthood and receive all their implants, aging ceases. Space Marines no longer have to worry about dying of old age or any other age-related disease or problem that humans experience.


While they don't worry about dying of old age, they always go into battle and risk death. Because of this, most Space Marines live around a few hundred years or even longer, although some elites of a season live well over a few hundred years.

6 Living coffins

Eternal service until death

Warhammer 40k: The Strongest Loyalist Space Marines in The Lore Image of Bjorn as a dreadnaught and model

  • It can keep a space marine alive even when he is almost dead.
  • In the season, it was highly regarded.

If a high-ranking and honorable Space Marine goes down in battle with a mostly dead body, they're transported to a machine that's basically a living coffin. This device keeps whatever is left of the Space Marines and his mind alive before being placed on the Dreadnought.


These machines continue to serve the Space Marines forever, keeping them alive even longer, now even stronger than before. Dreadnoughts are often held in honor because their service far exceeds that of the average Space Marine, essentially having life suspended before death.

5 Many genetic variations

They leave humanity behind

W40K W40K Howling Griffons Company

  • Approximately 20 additional organs
  • Increases the size of the space marines to make room for new organs.

During the process of becoming a Space Marine, they have between 19 and 21 new organs implanted into their bodies. This is done over many years in a specific order as the recipient's body grows room for additional implants.


Many of the additional implants are extra organs that allow the Space Marine to breathe in low-oxygen environments, filter blood faster to neutralize toxins, or the Black Carapse, which allows the Space Marine to interface directly with their Power Armor. While all of these implants are essential to the Space Marines, the most important is the Gene Seed.

4 Gene-seed and mutation

Make each season more unique

A large number of Space Wolves prepare for battle in a shelter with Stone Wolves behind them

  • The most important implant
  • Gene-seed comes from existing space marines.

The Gene-Seed is a special seasonal implant given to each Space Marine that truly turns them into a Space Marine and makes all of their additional implants function as a whole. The Gene-Seed is the most important part of a Space Marine, and upon death, the Gene-Seed of a dead Space Marine is extracted to be put into another new soldier.


Gene-Seed varies greatly from season to season, and many result in unique mutations or changes to the Space Marines' bodies or minds. Angels receive Black Fury blood from their gene seed, while Space Wolves have grown fangs just to name a few. Not every Chapter's Gene-Seed has these side effects, but every Chapter keeps its own Gene-Seed and keeps them as the most valuable part of the Chapter.

3 Extremely rare

The average person will never see one

Warhammer 40000 Space Marines 2 Full Biscuit Tribute

  • They are always fighting across the galaxy.
  • There are only about 1 million Space Marines.


Despite being the backbone of the Imperium, Space Marines are not often seen throughout the galaxy in the 41st Millennium due to the size of the galaxy and the number of Marines. Even fighting on the front lines, many in other factions of the Imperium go their entire lives without ever seeing a Space Marine.

The strength of the Space Marines usually means that an entire season is rarely in one place, as different companies fight on different fronts. It's incredibly rare to see an entire season together, making the events of Baal one of the biggest gatherings of Space Marines since the Heresy.

2 Codex Astartes

Keeping the space marines in line

Space Marine 2 - Titus On The Battle Barge

  • Over 1000 space marines in one season.
  • Some faithful chapters are not followed.


After Guilliman returned and saw the state of the Imperium in the 41st millennium, he wrote the Codex Astartes as a manual for all the Space Marine chapters. While not all chapters follow this book, the book's purpose is to guide as well as limit the Astartes.

Due to the codex, a chapter is limited to only 1,000 space marines, leading to many spin-off chapters. The goal is to divide the sole control of whoever heads a Space Marine chapter to ensure that no one person ever leads a force of thousands of Space Marines and leads to another heresy.

1 Primaris Space Marines

Space Marines, only better

Titus with his helmet in ultramarine armor

  • Upgrades that many consider heresy.
  • Current space marines can be upgraded and upgraded.


A new aspect of the Space Marines in the 41st Millennium are the Primaris Space Marines, which are larger, stronger, and faster than regular Space Marines. While this may sound like a good idea, adopting the Primaris Space Marines is different, as it is changing the basis of the Space Marines that came from the Emperor.

Guilliman is the current leader of the Imperium, and under his orders, the Primaris Space Marines are created and added to the various chapters, as the dangers of the galaxy are said to be greater than the “Firstborn” Space Marines can handle.

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