Zardnaar
Legend
The narrative of savage fast-breeding barbarians descending on virtuous settled folk and destroying civilization isn't peculiar to European or 20th century. It's a human universal. Every settled corner of the earth has been threatened, raided, and conquered by nomadic people since forever. It's basically the history of the world in a nutshell. The steppes of Asia ('the navel of the world') alone have pulsed out dozens of waves of conquest into China, India, the Near East, and Europe. And the literate people who lived in those regions wrote sagas and myths and histories about the monstrous savages who lurk in the darkness beyond the lantern-light of civilization. The actors change in time and place - it might be the Scythians threatening Persia's frontiers in the 6th century B.C., Celts menacing Italy in the 2nd century B.C., the Saxons invading Britain in the 7th century AD, or the Mongols invading China in the 12th, but the story of the savage horde threatening civilization is a story told a thousand times in a hundred languages.
If some people want to excise that narrative from RPGs and drama, then okay. But it's a global human trope they'll be excising, not a recent or peculiarly Western one.
This I did a paper on the silk road and yeah it's basically human history. Early chinese records complaining about raiders from the steppes.