On an average day
Something happened, William is an average gamer who got rolled over by a truck.
And of course like all over used plot lines he naturally got reincarnated in the world of sword and magic. (Technically true if you're born on a fuedal world)
It's just that it's also has guns and space ships! And it's set in the grim dark future there's only war.
He's been reborn in the 40k universe! Fortunately his father is minor noble and unfortunately he's been born as the 6th son. So he can just forget about any hope succeeding the family.
So he'll most likely be sent to the guard as a minor officer and stationed at some back water planet for the rest of his life. He could forget about career advancement as nobody would pay attention to some back water planet.
While he had hoped to be born as the only son of a planetary governor but beggars can't be choosers especially when considering the alternative.
He could have been born as a factory worker in a hive world where he'll be thinking that those people being 'exploited' making 1 dollar a day is the dream life.
Anyway before before that his boring ass life stuck in some backwards planet doing garrison duty he still has a childhood to live.
Not that he's hoping to be sent to the frontlines, it's just that... well never mind life in 40k is all shit anyways except for 0.000000001% of the total population.
Anyway he grows up 'normally' meaning he pretended to be a restarted annoying human child. He doesn't want to be called demon spawn and be shot in the head after all.
'Oh a walking talking baby that just born yesterday' William is pretty sure the inquisition would be knocking pretty soon if he did that.
They have eyes and ears everywhere, especially since he's a noble born. Most people in 40k doesn't really consider non-noble or people without any particular talents as actual people. They are like... disposables or meat shields or minor annoyances when they revolt.
Knowing that William pretty much started acting since he's born. It's like living in Big Brother's House where every single action is monitored.
'I better not do something stupid' William kept reminding himself as he's growing up as he clearly knows that if he fucks up, that metaphorical gun will materialised and kill him in the most horrible brutal way possible.
Fortunately as he's growing that restrictions gradually becomes lesser as he no longer needs to pretend as an annoying baby.
And it's not like it's all pretend, he still has to learn the language, history, so social conduct and equity.
There's only so much detail in the books and games. Despite the depth that 40k is known for the things they covered are just a small part of the actual thing.
Despite knowing that high gothic is a combination of Earth's major languages meaning Englis, Chinese and Spanish.
In his previous life he naturally knows English a bit of Spanish from his grandmother and Chinese from watching all those Kung Fu movies. Dispite that he still had a hard time learning it.
Undoubtedly there's a lot of changes that took place in the languages to result in the high gothic, such as vowel shifts and cultural trends or even affected by Xeno languages.
After high gothic there's low gothic and a few other common languages.
The Next thing that gave William a hard time is history.
In his past life, William is more or less somewhat interested in history. It like reading a story only it actually happened, interesting to note that the amount of depth of the story what captivated him. That lack of sugar coating, sensoring bloody brutal or even morally questionable scenes is the alluring part. That's also why he like 40k.
Saying that dispite having an interest there's simply a lot of history. The planet he's currently living on alone is enough to have dedicated people spend their whole life studying, not to mention the Million other planets in The Imperium.
Also imperial records are always subjected to sensoring and modifications to fit the current agenda so William can't really trust what the books say 100%.
While history mildly interest him what really captivated him is the technology.
William naturally is not interested in becoming at tech-priest. Having lived in the 21st century he naturally thinks that this whole machine spirit and machine god thing is nonsense (of course he'll not say that out loud) also the idea of his 'Little William' removed and replaced with a data port simply horrifies him.
Having been in a Sci-fi universe, he naturally is curious how it all works.
Also while he's very much interested in the technology, it more like a hobby kinda thing and not studying for the exam kinda thing (not that he studied in his exams anyway) also since every expert in the field believes in machine spirit, his progress is naturally slow.
He of course can't ask anybody questions on how the machine actually works, he had to figure it out himself. Fortunately the Internet forums in his previous life shed a lot of light on how these things actually works.
So progress is slow.
As a reincarnator he naturally has a cheat, that is super luck or plot armor.
Basically anybody trying to harm him will suffer critical fails. Like gun jams, gun fell apart, shots misses, slipping causing the shot to miss...
Also anything he does randomly would result in the most favourable outcome. Like coin toss, he always win at coin toss unless he deliberately loses.
William discovered this cheat growing up.
Even though he has the cheat that doesn't mean he should go wild. As this cheat has certain limitations like it only works in his immediate situation.
He discovered this limitation during a quiz which he didn't study for. He randomly pick the answers without even reading the questions.
The next day the results came and he did badly.
Not that these test scores will mean anything anyway he's pretty much destined to join guard.
So he spend his days lazying around and doing everything he wants at his own pace.
During his time he had toyed and experimented with a few of the future tech, hoping to discover its secret.
There's naturally some success and some failures, he ended up with a few interesting gadgets.
He created a gas mask that that has night vision, thermal vision , can function in the void, has a Heads Up Display or HUD for short (still needs some work as he plans to add a few more functions but for now it only has a mini map, record videos and vox(radio)) and flash light eyes.
He draws inspiration for the design from the helgasht in the game killzone.
Time passed and eventually it's time he enrolled into the military academy.
Unfortunately due to the busy schedule, strictness of the academy and the fact that he's from minor nobility (which didn't grant him much leeway as everyone in the academy is pretty much from higher nobility or someone of great background, the academy would more or less allow them to cut class) So he doesn't have much free time on his hobbies.
Now as for classes him being a gamer in his past life naturally gave him some advantages. Those strategy games he had played finally saw some use.
'Hearts Of Iron, Men Of War, Total War...' William recalls all the strategy games he had played as he is being questioned by the instructor on what to do in certain situations.
While they might not be 100% accurate but they did however gave him a big advantage nonetheless. So he's above average in class.
Of course there's always some ridiculous Over Powered guy in class who's just good at everything.
Those whore...I mean those rare noble girls naturally all flock to him, being form a big noble family and having great talent him future prospects is limitless. William totally understands that they naturally would want ride up the ladder.
Yeah... he's not like jealous or anything... yeah... definitely.
William feels depressed trying to deny reality.
Well.. it could have something to do with the mask he's always wearing, they're probably assuming that his face is deformed or something. The academy for the most part did pay much attention to it as William as they just probably assumes that he has been influenced by the mechanicus in replacing body parts with machine.
Cybernetic augmentation is accepted in the academy as there're people walking around with metal arms and legs.
Anyway time passed
He eventually graduated and got deployed as a second lieutenant to garrison some backwater agri-world.
Since he attended the academy, he gets to start as a lieutenant. That means he's in charge of a platoon.
Since it's garrison duty he gets to slack off and delegate all his job in to his assistant.
William dreams about the perfect life of getting paid while doing nothing, he could even perhaps abuse his authority and be the king of the hill or something, get a little bit of protection fees or... he he he.
As long as he doesn't do something major like slaughtering entire villages for no reason nobody would care.
So with nothing else to do he say is goodbyes to his family, pack his bags and heads off.