Create to Kill a Hero

I was given a simple task, in words, to kill a hero.However, it turned out to be a little more complicated... I don't have the slightest idea how to kill or even just live outside my room. And what can I do when my goal is an invincible and brilliant guy who cuts through the strongest monsters like paper?All I have to do is join his team to get closer, only it doesn't add up to the possibility of accomplishing my goal... Maybe the hero isn't the best enemy? And anyway, no one told me he wasn't the only one...