The only people to destroy the to man were the turk.
Atila the hun ravaged entire Europe causing the German tribes to move southwards and overcame roman empire. Rome fell to the lombards.
And ottomans destroyed Constantinople and the last bastion of roman era under Greek speaking byzantine.
Ottomans were hardly Central Asian, Siberian, Mongolian Turks.
They were more like Greeks and neighbours who identified themselves as Turkish speaking tribes.
It still took Turks some 400+ years to capture an already decaying Istanbul.
To think Istanbul had a history of over 700years under Byzantine, and it has not yet been under Turkish rule for that long, tells you sth about Greek history. Ibn Battuta had also visited Constantinopole and praised it for some reasons but not so much for others.
All said the Ottomans couldn ever conquer all of Europe, at all, for over 600 years. Just constantinopole took them Turks over 400 years. Attila could never conquer Europe either. As for Mongols, it is possible they could have conquered europe, but due to certain reasons, they stopped in their tracks in eastern europe. it's nothing like say Egyptians (mamlukes or slaves, turkics) who defeated Mongols, or let's say, Muslims who defeated Mongols repeatedly close to Delhi. The heathen polytheist slanty wuhan virus carrying Mongols couldn ever even make it to Bangla or Sumatra or Malaya, for example, Or to Yemen, or Egypt, or Libya, Tunisia, Morocco, Algeria. Or to nig afro lands either.
Now you might add nig afros never had any civilization to begin with. that's true.
