God and demon

Humanity is on the brink of destruction, because of the Demons Gods. Kail, a Master from the Swords Guild, lying in the middle of a body field, was about to die. He close his eyes as his blood turn cold, but after a unknown amount of time, Kail opened his eyes again. He was still alive, back 20 years in time, in his prime. As he remember his precedent futur, as a captain from the strongest group of the Sword Guild, he know what was done was not enough to protect humanity. Now he have to fix the precedents mistakes and destroy the 42 Demons Gods.