I don't know how far have you been reading but for me this story is pretty good actually. He later on created some technique to kill the hero. The first technique that he use is when some guy from a different country invade his waifu's homeland. He pretends to be a knight from the territory and ask for a duel with the leader of the invader. Before he starts the duel he ask the opponent couple of questions to buy some time for the skill to arrive. Just when the duel about to start he reveals that he is not a knight but an assassin so he won't be having a chivalry duel, and then the skill arrives from the top of the opponent's blind spot and supposedly instant kill his opponent and surrounding enemy soldier(he had ally soldier to stand back far away from the radius of the skill). The skill name is called God Spear 'Gungnir'. Before he went to duel he already activate this skill, he use magic to lift a spear on to the sky, let it fall to build up velocity and hit the target.The skill sound simple yet difficult. The skill required large amount of mana, time and precise calculation for the target location. The attack is supposedly instant kill his opponent since it come from blind spot with power of a meteor strike. After the devastating blow he check for his opponent vital status under the hole and found nothing was in it, his opponent somehow got teleported somewhere and could be a survivor. He later found out that his opponent is a guy that receive some fraction of hero's power.
== I could spoil more until he receive hero's power but after that I haven't read yet.==