In my story, the villain is this demi-God, who was thought to be dead for 50 years resurfaces. The Gods know he's alive and informs the hero who "killed" him 50 years ago. But my problem is, this situation brings up the question if the Gods know about it why aren't they doing anything. I was going to go with they made a promise not to directly interfere with affairs of mortals but that doesn't seem like a good enough reason to me, especially considering the large threat the villain is going to be. What's a good, believable way to handicap Gods? Or what's a good reason for them not to want to interfere with this problem?