WI: A second, Slavic Attila?

Deleted member 97083

What if in the late 500s or early 600s, a bit more than a century after the death of Attila the Hun, the Slavs were united by a great ruler who conquered virtually all of the Northern European Plain?

Byzantine historian Procopius reported that the Slavs fought alongside the Avars, from which they adopted steppe tactics. But the early Slavs seemed to be more numerous than the Huns themselves ever were, likely due to being itinerant agriculturalists instead of pastoralists. The early Slavonic language could be the lingua franca of this new, probably temporary empire.

In any case, if there was a Slavic version of Attila, how much could he conquer, and what might the lasting effects be?
 
The spread of Slavs must have been limited in someway by numbers. Could Slavs colonise, subjugate and assimilate larger areas than they did in OTL? What i wonder is how such a conquest might inpact the religous landscape of Europe? And if the Slavs would abandon land to move westward, maybe Finnic languages would spread more?
 
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