Executioner of Heroes

have you ever wondered what happened to those heroes whose legends you heard after the tale ended? Did they eventfully die of old age or is something more sinister happening behind the scenes? When they achieved immortality what did they eventfully end up doing?

The Main Character has always been curious about how the immortals can't die of old age so how did they end up dying? Turns out there is a reason and why it is not told. He will soon be a part of the reason why it does not tell their end

Just So you know the MC is going to be powerful after all he is hunting HEROS however he will not just sneeze in their direction and they will die.