The tale of the Kingslayer

Long, long ago, in some very different place, there was a world ravaged with a plague. It is said that the old king, touched by the disease himself, went insane. As time passed, his orders got crueler and more impossible, and his subjects were worked to death or went insane following those abstract tasks.
Among the subjects, there were two young brothers. The older one was brave, charismatic, and hardworking, but also quick-tempered. The younger one was filled with fears, something that he had to face every day. The plague took their parents away.
One day, the older brother overheard a group of people scheming against the king. They were talking about the upcoming uprising. The older brother asked them to let him join their cause, hoping that without the king, he and his little brother wouldn't have to come home exhausted every day. And so the two of them became members of the resistance.
But a week before the uprising, a new king's order was announced. According to the king's wishes, the workload of half of his subjects would be doubled. Fearing for his younger brother's life, the older brother gathered a group of his trusted friends. They decided to assassinate the king.
Under the cover of the night, they moved. The group managed to sneak in into the castle and pass by the guards unseen. The king wasn't in his bed-chamber, so their next target was the throne room. And as they entered it, they could see his silhouette slumped over on the throne. Though none of them made a sound, the old king knew they were there. He asked them to leave if they don't want to die. But not one of them decided to listen to his words.
The next day, a few new bodies joined the ones hanging in front of the castle. The bodies of traitors. The younger brother looked for his sibling everywhere during the breaks between the work, not knowing where he is. Seeing him do that even after his shift has ended, a local blacksmith decided to show him the truth.
The young one stayed there until there were no more tears in his eyes.
It is said that when he was gone, the blacksmith collected both some of his tears and the blood of his brother and used them in the creation of the sword. A blade capable of ending the king's reign. A few days later, on an eve of the uprising, he visited the younger brother and gave him the sword. This gift, the words of the blacksmith and the other revolutionists, all of those things replaced younger brother's fears with hate for the king.
So when the day of the uprising came, he joined others. They stormed the castle, sweeping all who tried to oppose them like an avalanche. The revolutionists flooded the throne room. And the king waited for them there. He didn't plan to go without a fight. And while the rebel numbers were large, he started going through them with his spear and bare fists. He was a wild beast that turned from prey into a predator.
That was until, in the middle of his carnage, he noticed a young boy, pointing a sword in his trembling hands at him. A boy resembling the young man he killed a few days ago. He stopped in his track and looked around the people he just massacred and those who still lived. Those were his subjects. The king fell to his knees, his head low. The boy moved towards him, one step, then another. No one else had the courage to move towards their ruler. A blade of the sword shined in the air and swung down.
King's head rolled on the floor.
It is said that when other people realized what just happened, their cheers broke the silence for the rest of that day. They carried the boy out on their hands, calling out his name.
It is said that when they were leaving the throne room, the boy dropped his sword.
It is said that hours later when someone decided to go back for the sword to bring it back to him, both the sword and king's body were gone.

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Related item:
Kingslayer
Related people:
The King