In Memoriam (Aimtrooper)

In Memoriam happens in a future not too distant, where emus, giant Australian birds, seek vengeance against humanity for the war they started unjustly. Having developed intelligence, the emus sought the protagonist’s grandfather and stole the philosopher’s stone. 

With the philosopher’s stone in their hands, the emus travelled back in time, changing some of history’s most famous figures into villains, altering humanity’s history.