I have drawn a lot of inspiration from idle click and space exploration games, and some of these throw away phrases can very easily become revolutionary and cultural transformative things.
Life imitates art, and art imitates life
From the cradle to the grave, the small things that define every human life.
Part of the Fermi Paradox, the Great Filter is one of the explanations as to why intelligent alien life hasn't been discovered.
In settings where there are long established underworld thief, criminal and otherwise ne'er do wells there is going to be a system of heraldry associated with those who live in and rule from the shadows.
Why is magic used by so few when it is so much use?
Knowing is Half the Battle, red and blue lasers are the other half.
The plague of the Petroleum Era, the true bane of organized government
The first Renaissance was kickstarted by the Crusades and trade, the second Renaissance was fueled by a looming global crisis and international cooperation
A foundation 'Secret' of the Cosmic Era
The commericaly available firearms of the Cosmic Era
One of the events regularly overlooked in the history of the Cosmic Era is the Population Contraction that was concurrent with the Second Dark Age.
A re-evaluation of the basic concept of Man vs. Nature
In the art of several ancient kingdoms is was customary to stylize the monsters depicted. Even the most comely of elves would be drawn with too-pointed face and too-slanted eyes, to keep the up-standing human community of the kingdoms from thinking of the elves as being better than themselves.
It is easy to forget in our fast paced globally connected world what the reality of village life would have been like.
The races of Kuramen are a strange lot, descending down a long lineage from the First Race; prone to dramatic evolutions and born to a world divided, each does the best it can to survive.
In pretty much every single sci-fi there is one thing common for all the seemingly different faster-than-light drives.
Nano-technology - Not Sufficiently Advanced, as per the Arthur C. Clarke gold standard of sufficiently advanced technology.
"...a process of planetary engineering, specifically directed at enhancing the capacity of an extra-terrestrial planetary environment to support life. The ultimate in terraforming would be to create an uncontained planetary biosphere emulating all the functions of the biosphere of the Earth, one that would be fully habitable for human beings."
The local band of 'nasties' (goblins / orcs / whatever) lives in relative peace with the local population.
Along come the PCs and go through their usual heroic monster bashing routine, wiping out the nasties and pinching all their stuff, then continue on their way.
Problem is, they don't kill ALL he nasties. The survivors want revenge and, after spending a few months recovering, start to take it in their own inimitable style (which is not unlike that of the PCs come to think of it).
Next time the PCs are in the area they find themselves VERY unpopular with the townsfolk.