Which three invaders of the roman empire came from asia

The Tartars or Mughals, of which the Huns excelled, that were born of a mixture of races, like Finns, Lapps, Bulgarians and Hungarians. the Mughals, who already owned Asia and became the scourge of Europeans, were who came first leaded by Attila the Hun. Of primitive customs, they were skilful horsemen and fearsome combatants, without scruples of any nature. They lived practically on horseback and fed almost exclusively on meat.

The answer is challenging and taxing because arduous means when something is hard and tiring and the excerpt provides clear detail why that's the answer