Sincere salutations.

... As for their race, culture and language, I made up with two theories (plots) for their origin:



1: They're normal peoples of Planet Earth, they're here from the epoch of Noah. They natively live in Karelia-Murmansk/Eastern Siberia.



2: long story short: (sorry for the language, wrote it quickly)

They lived on another planet, which was habitable and all, not too far from Earth, and that planet had other nations and some unique stuff, such as greenish-blue atmosphere, abundancy of yellow-coloured flora, and scarcity of edible fauna. That planet had a dozen of cultures and stuff, and they rose from their stone ages quickly. Wars were rare.



When the peoples of this planet reached the technologies of Earth Humans' the 1300s (14th century) it was 2019 here, and a mad Turkish scientist, residing in Lębork County in Poland, managed to create a portal that penetrates spacetime. He originally wanted to see his idol, Attila the Hun for himself and set the time in the machine to 435 CE.



But instead of going through time, he travelled solely through space, and landed on the shores of a Gundi kingdom, in that said planet, with time unchanged.

Scared, he tried to talk with the Gundi natives. Startled villagers pointed at a distant island for him to go, thinking he was a foreigner. The scientist, carrying his invention, asked for a boat that carried him there, employing hand gestures.



A sailor agreed, and the scientist gave him 12 groszy (cupronickel Polish coins). He found out that the island was a monastery, and the residents there were highly-educated theologians and scholars, one of them was the Patriarch of a Gundi faith. He offered the scientist a room, and the scientist ate some (exotic) vegetables and slept.



At night, there was a blinding light that woke him. He realized it is a huge planet (probably a gas giant) that will soon impact this planet. Then he gestured to the patriarch that "ball, -pointing at the ground- hit, bam whoosh! -death sounds- -everything gesture-!". That coincides with a thing in their faith that God (their religion was monotheistic) will destroy the universe when evil outweighs good, with a raging demon the size of the heavens, but the oceans will lift the faithful out of the apocalypse (because how the land was distributed in that planet, and helluva big oceans existed, it made sense their planet was flat, and water is falling in the edges.)



So the patriarch contacted kings and dukes, who ordered counts and barons to construct huge ships to contain the nation of the Gundi and take them to safety. The Gundis who lived by the Northern Sea were more proficient in boatmaking and were very religious. The ships they made were massive and they contained a lot of important stuff: people, books, manuscripts, religious and historic texts, depictions of stuff, money and some flora et fauna. Plus, the Patriarch's Isle was located in the north.



The Gundis of the south were farmers and caravaneers, many of them never saw a wide body of water, and most of them were cynical and hedonistic. The boats they made were mediocre and hardly contained the people. That is why most of the heritage and literature of the Southerners was lost forever. Other nations started raiding at empty villages, frightened from people's absence and bewildered from their strange inland ships.



Anyways, when the Gundis finished, the gas giant got closer and its raging storms were now easily seen, as the sight easily occupied the night sky. Meanwhile, the scientist was eating fish, when a man accidentally pushed the inactive time-travelling machine off a counter. The scientist rose and punched the man, and a fight broke out. The patriarch wanted to separate the men, when he stepped on the invention, making it active, aaand under pressure from his feet. The invention took all the boats within 300 kilometres of its reach to Polish coasts on Earth, with time set at 435 CE.



The pious Gundis of the North settled at the coast, while the patriarch and his men sailed even farther, reaching Gotland. The Gundis of the South spread south, in Mainland Europe. Gundis of the East and Gundis of the West perished, and their heritage was gone. Their planet of origin got destroyed.

thats all