Result of the Mongol period? Which societies
gained the least?

The Mongol invasions and conquests took place during the 13th century, creating the vast Mongol Empire which by 1300 covered large parts of Eurasia. Historians regard the Mongol devastation as one of the deadliest episodes in history. In addition, Mongol expeditions may have spread the bubonic plague across much of Eurasia, helping to spark the Black Death of the 14th century

because dead babies can't fart