Legendary Awakening: Strongest Class In the Apocalypse

Awakening a Legendary Class in the apocalypse...? Not even in his wildest reams Xavier could have imagined things would take turn for the better. Xavier was rotting in some corner of federal prison, destined to live a miserable life. However everything changed, when the apoclypse arrived. While the world around him burned, Xavier awakened a class, that rewarded him for killing monsters in one strike...for creating kill streaks!! [Ding! Hundred monster Successfully executed, All Attributes increased by 100%] While others were struggling kill basic Zombie, He killed the god of apocalypse in one hit. [kill streak - One million] [All of hosts attributes are increased by a million times.] With this prompt, Xavier ended the crisis that had been plauging the galaxy for millions of years.