I am not completely shure but I would guess the Huns,
West
Black Death
north to south or south to north
north to south or south to north
nomads
the steppes
Nomads are known to have traveled across various continents, including Asia, Africa, Europe, and North America. The specific continents would depend on the nomadic group and their historical movements.
across Asia to Europe?
Asia & Europe
North and South America.
the himalayas
No, if you look at a world map you will see that Europe is WEST of Asia