Regarding the game narratives, something you will find not present in games from 20-30 years ago, is a major shift in the narratives.
Regarding the doom and gloom, end times narratives seemingly out of nowhere, these were pushed by certain groups of people with money on demand. Suddenly many of the games started spouting these. Everybody does not change tune all of a sudden by themselves after all.
I was wondering why that was the case, what kind of ideas, or values these games were spreading. (or manipulation, disinfo, dissonance) Since as a player, youre playing as some sort of empire of sorts.
Why spread ideology. Ideology is an instrument of power, thus control, it, in the process takes the ability to think critically away and helps through artificial leaders mobilize and control masses of people to do what the ideologues want, something that without external inputs, they would not do.
Why ideology of superiority, misnamed as exceptionalism (I remember a politician wrote such an article like a decade or more ago in a newspaper justifying it (lol))
How to spread an ideology of racial, ideological, scientific, superiority in contrast with others racial, ideological, societal whatever, inferiority. Why do you need them ? Objective being amassing power in zero-sum environment, giving nothing, taking everything, squeezing everything of value then throwing it away. Maximum efficiency, cynicism to 1000%. People, armies need to be used, otherwise they are useless kind of narrative. They have no agency their own. They are tools to be used, not served. That is how imperial thought often degenerates into.
Since what youre trying to do is evil, evil needs to camouflage itself in an envelope of the good.
How do you do that, you claim you are doing the opposite while doing what you are intending to do, projecting yourself (your agenda) to your adversaries. (that being everybody outside your close circle of lets call them, your co-conspirators) Ideas, values, ideology you want to spread, keep the communication one-way, pretending to not hear the other side, because you control the means of communication and can shut the other side down.
The superiority ideology comes in quite a few layers, (a lot actually) it is obviously built around a hierarchy. (and I hope you will have some laugh as I go deeper in some explanations/descriptions just for you
and give example)
You would build a value system, that rewards the least inhibited persons to get into highest positions, because of their being unhinged, or you grow them in extra abusive environment from a young age and teach them deliberately wrong reactions to various stimuli. This is somebody for the masses, an actor of sorts. Distract from real issues by creation of fake ones. (Aliens are coming !
, for real bro ! This time
)
Then you need to divide the people into 'The People' And 'Less-than-People'. There being 'biological' thus 'Scientific' proof of said superiority/inferiority. (Scientism, I said this is 'Science' and I agree with myself and like-minded people, make a consensus, so we are 'right', you form an inquisition hunting down any 'Unscientific heathen', enforce thought uniformity, saying opinion diversity of course, we actually came from a different planet, what was it, Thule ?
(Thule Society of Adolf times))
How do you classify/subdivide the castes of Less-Than-People ? Are they found in the Land of the 'People' ? Those happen to be servants, subjects. For example, those outside your empire 'scientifically' even lack a soul. Those inside your ruled space, those have a soul, those are still Less-than-People. But resemble the People, even as they are an 'inferior race'. But you will use them for now, until they are not needed anymore.
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(if you live in the EU, only the money elite in the West are considered 'People' as an example, everybody else is visibly put into castes going from West to East as Less-than-People, (Under)class I, class II, class III, Ukrainians would be like class V, RF class VI-XV and so on, Chinese would be there in class XX I suppose in the warped 'People's value 'system', reminds very much of various feudals, aristocracy and their suppositions and superstitions, those Less-than-People, the soulless ones, class VI, people-in-form-only are trying to steal the souls of our UnderClass V, be so afraid they are gonna take everything !!!
, pretend like you care about them) Not even saying the Class XX working together with Class VI Underclass, it is the end !
Note the Science behind all this Scientific method of doing Science and all the proofs I provided, not 
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So, you have a clearly stated divide between the Ueber 'rulers', who hate all the 'inferiors', including 'their own'. But to keep their Ueber status, they need to keep their 'Inferior races' within their rule, in constant tension, because those soulless Less-than-People are actually trying to eat their souls even, (to keep threat from underclass races low/nonexistent) their Less-than-People 'humanity' and turn them into human-in-form-only soulless beasts, insects, or even, disease. Just like they are, into their own, 'inhuman' image. (I am making here an upside down warped narrative so you need to do some mind gymnastics in case this thought pattern is somehow new or outlandish to you, I have had a lot of experience with these, so I know it in great detail, such behavior you can encounter with bureaucrats who think universe is circling them as well, thinking to be untouchable and think they can get away with abuse of power, while they are your servants since they serve your state and the state belongs to you, not them)
The Disease from the point of these 'People' is everybody outside their sectarian-elitist group, partially diseased are their own subjects (lesser status, less wealth-disease, they need to be dispossessed of stuff they have more, but the cause is outside ostensibly, outside and internal enemies, but not the 'People' Of course !) who have to be kept in check to prevent the plague from spreading. The Plague has to be purged. No way around it.
Have you ever heard of these types of people claiming how they wish to save the environment, save the planet ? Save the animals even ?
How do you do that ?
You elevate the status of the 'planet', the 'environment', the 'animals' above your Less-than-People. (which in turn degrades the Less-than-People into less than Animal category) You save the planet from ? The Disease (they mean you really
) from the Environmental Hazard (Guess who, not what that is
) Animals are pretty outrageous, because animals can be slaughtered for food and when somebody is telling you that say a mouse, a chicken, or cow, horse, are above your status, your worth, it states obvious, that in the 'People's hierarchy, everything in Less-than-People is considered to be less than animals. (preparing grounds for your extermination if you do not worship and obey them, let them rob you expecting you to say Thank You !) Life expectancy to be shortened by any whim of the 'People' or by 'Protecting' Less-than-people from People-in-form-only (unprovoked foreign aggressing as a rule, Protecting turned upside down meaning of starting a war of aggression). That is, if they are allowed to live that long.
You might have wondered, where such outlandish ideas are coming from ? I will take Mass Effect, the 'Human-Reaper'. These (Aliens again !) guys are portrayed as murdering incredible amounts of people and using up their remains as building material for the Future (! building empires on others bones ?). If you know some history, not all that long ago, you had 'People' using Less-than-People, do that to who they considered Animals in Human-Form-only, used their bodies to make all sorts of 'leather' objects, soap and such. (Ustashas too come to mind, biowarfare,(calling themselves 'Research') Unit 731 from overseas AND where it ended up, promoted !) In Mass Effect games, the 'People' represent The Reapers. Their intents, wishes, are all projected away from the real 'People' into some remotely-remote fantasy. Though this is to make it seem not real, when it is how these 'People' exactly feel about things. So you could understand it as somebody laughing in your face while threatening your life no less. Claiming Plausible Deniability - we did not say or imply that. It is only so in your imagination
Ok bro
Truth telling isnt then your strong point 
The 'People' might pretend to fight against the 'People' (or pretend division in their cult-like organization) by using the 'lesser species'. while acting out their own orders,agendas (inferior geth). But the 'People' ('Scientism-Uebers') pretend Uninvolvement and even peace-mongering. Oooh , we stumbled into war again, how unexpected, and unplanned for event. We REALLY wanted peace ! We said so, while we did everything to make war inevitable. So, which is true, words, or deeds when they are the opposite ? You dont stumble into something you planned for all the time.
Overall agenda, of the only 'People' is to get rid of the Disease. I forgot the name of the member of the 'People', who in his old age claimed that he wanted to be reborn or something, like a deadly virus. That was from some decade ago. The thought process is not new, it is about either ruling over everything or destroying it. Either I rule, or there will be nothing to rule over. Not everybody thinks this way. But these exist and they consider themselves way above everybody else. This is their actual disease. (or the Sin of Pride first of all)
The 'People' think that everything belongs to them, so whatever you think you have, is in their sight not so, because the Less-than-People really do have nothing apart from it being in their imagination according to the 'People'. If there is too many of you eating up 'their' resources, then they intend to 'Mow the Grass' (Less-Than-People) mowing the grass is not mowing down actual People, it has no rights, it is worth sacrificing, the resource, because those are not People. Less-than-People, Humans-in-form-only, all these infringe on the ability of 'People' to exercise their imagined omnipotence, like them deciding over who lives and who does not.
Also, 'People' tell the 'Less-than-People' that they are on the same side. That being not the case in reality at all, because they are parasites in the extreme needed by nobody, it is the who in actual reality, are useless and helpless without their reliance on being served to do no good in the end. Inferiors are an inferior in the 'biologal-scientism-ic' sense ('Science' of eugenics, you can make stuff up no proof needed, repeat the claims it is the materialistic godhood of Science, It is Proven (Registered or TradeMarked), end of 'discussion', The Settled Science.)
So, People (Uebers) pretend to be friend of Less-than-people, while trying to get rid of their Disease, (status 'race' disease, can't be cured, ultra wealthy isnt easily throwing away his idol of profits, status away easily at all) while those outside their rule are the Disease which they 'claim' does not even have a soul. ('Science' or some other unprovable quality) 'People' on the other hand are superbly virtuous, even the 'Scientism of Eugenics' will definitely prove that. In the End, Only The People are to be left, after all the animals, environments, planets, galaxies, also Human Rights are saved. Human Rights in the Sense, that only Full Humans, 'People' have rights. The rest are accused of all the actual evils the 'People' commit/ed or want to commit. Only 'People' decide who they are, only they can elevate the Less-than-People into the caste of the wannabegods.
To save 'People' all expenses are to be made at the cost of 'Less-than-people' as well as 'humans-in-form-only'.
I hope you liked the mental gymnastics
Anybody with observation skills can pretty much come to these results.
I guess the Harbingers might work along these 'value' systems. They grow overconfident, nobody stopped us in the whole universe, then, the missing scale of the dragon shows up and our hero happily shoots the 4-armed (or prodded or whatever) space-crossbow/ballista and as big as he was, gets a guided plasma arrow through the hole in previously damaged armor hitting the heart, causing it to collapse in a lake. From a great height, as it entered the atmosphere, burnt up and crashed in a big lake, making a big wave.
The virtues of an imagined superiority yield very destructive results. We will defeat them in 3 weeks, 4+ years later cemeteries full, false grandiosity gone is how it usually ends up. Our Scientific Scryers have foreseen our victory, it must be true
We ate all the wisdom there was, but grew dumber with every generation 
When you look at this thought process, the inversion of reality on so many points, results in a faulty process, which yields incorrect results. If any or more factions in the campaign get more of such crazies in decision making, you will see doubling down on failure, if something fails 10 times in a row, you need to try the 11th time, those bad guys are so weakened like you wouldnt believe ! 11th time, they grew even weaker, they ran out of resources ! Our secret sources say so. on the 12th try it will work, we know this time what we are doing ! And then there is no 13th wave, because the enemy steamrolls you in 1 overwhelming attack
Delusions of Grandeur suddenly collapse and reality finally delivers a final blow. And all the delusional propaganda falls apart in face of reality.
I think that the mechanics of superiority/inferiority ideology are important, perhaps my long text made it a bit more understandable. Plus some observations from RL. (there is not only a wave of 'Class' going from West to East, there is also one from North to south btw) Perhaps you found some of it interesting.