Owing to a disastrous first contact situation, the Indibrizi people of Southern Rudagoiter are almost entirely unknown to the modern world. The modern world however is wholly known to them, and they are among the most culturally omniscient people in the world, with one caveat: They don’t believe what they know.
The Indibrizi have two levels of truth- Spoken Truth and Written Truth. To them, these are very different things. Spoken Truth to them may be real or fiction. Stories are told including parables and histories alike. Little distinction is made between the two, as Spoken Truth is simply known to be fallible and often fictitious.
Written Truth however, is absolutely true and exclusively true. The concept of fictional writing is utterly alien to them, and more than that, blasphemous. Though an individual among them might be accused of something orally, this would hold little sway and would be openly joked about for its unknown veracity. But if an accusation were written, it would be true, and acted on, even to the death of that individual if warranted. That is not to say merely that it would be treated as true, but it would be beyond all doubt, it would become true were it not already. Thus the idea of writing fiction is beyond obscenity, it would be to warp the very fabric of existence.
The Indibrizi were first encountered by American missionaries, and the missionaries preached to them after learning their native language. They preached by spoken word, and were therefore regarded as good storytellers who were making up the stories they told. This was not offensive to the Idibrizi, they were flattered that the newcomers were kind enough to tell them tales, much as modern culture sees movies.
The problems began when the missionaries taught the Indibrizi English, and gave them a Holy Bible.
Now, the Indibrizi have very few written documents owing to their absolutism. Their longest known work, a history of one of their villages, is only a few pages long. Those few pages however contained their mythology, which stated that the world was created by billions of years of cosmic turmoil, and that they themselves were the result of millions of years of generational change from something resembling amoebae.
The Bible, a written document stating the world was made in seven days by God, ran counter to their written absolute truth.
Within a day of being presented with a Bible, the contacted Indibrizi skinned, boiled, seasoned, cooked, and ate every one of the missionaries. The U.N. immediately banned all travel to Rudagoiter, and those laws have protected the Indibrizi from new cultures ever since, and indeed now protect newer cultures from them.
But the effects of that first contact last until this day. Most notably, drone observations have confirmed the writing of longer and more complex truths than had ever been written before contact. The longest of these is 28 pages and describes the story of contact with the missionaries, including the recipe they used to cook them.
Most importantly, the missionaries left behind their clothing, airplane, biodiesel generator, and smartphones, which in that region have near perfect reception.
The Indibrizi had seen the missionaries using the phones and, having learned English quickly, have been seen using the phones frequently. Long distance observations suggest they regard them with a new category that they call “Light Writing” or writing which is made solely of light on the phone screens, and is believed capable of recording only fiction.
Over the last few years they have read every book on Project Gutenberg (Including the Bible, confirming its fictionality to them), seen articles across Wikipedia, and followed international news knowing in their deepest souls that absolutely none of it is true.