Humanity and its raging fangs

What happens when in a different world, humanity had lost most of its emotion and people to a cruel game of the gods. A game where they face different races and monsters to fight for the gods entertainment. What is, when after centuries humanities population was so thinned out that the gods need to summon one more human, ripping them from their world and placing them in the game. Only did they do a slight mistake, they gave him the power to use everything humanity has created before. It did not in fact took long for this human to find a loophole. It seems fiction did count as something humanity has created..