Humans are our Enemy

Mischa was once a nation in unity, with the four main peoples of the land remaining in somewhat harmony. The four main peoples were as follows;
Avians, those who dared to visit the floating islands thousands of years ago, and were gifted with the amulet of flight.
Merfolk, those who drowned at sea on voyages when humans first learnt to sail, and where gifted the amulet of the waters.
Centaurs, those who fell into the traps of the old Cave King, and were gifted with what he saw as a prized beauty, a horse body.
And Humans, those who, over time, became terrified of those with amulets, and the fear turned to anger, and they started the war.
The year is 585, marked by the year of the first attacks. And Avians, Merfolk, Centaurs, and even humans, have to locate the three gods who bestowed the amulets all those years ago to save what little remains of Mischa.