"Why are you crying? What is troubling you?" Arthur asked.
The man explained to Arthur that they were crying because all eight of his other daughters had been killed. He told Arthur about a great eight-headed dragon. This dragon was the most powerful beast in the land. He explained that every year the beast has come and taken one of his daughters from them. He is terrified of losing his last daughter.
The father explained that they had tried moving or hiding, but it was all in vain. The dragon was inevitable. Arthur saw the family's pain and asked if there was anything he could do to help. He offered his protection, but the father declined because he said it would be to no avail. No human or being could take on the dragon head on. It was too powerful.
However, Arthur was not one to give up. He deliberated and then he spoke too the man.
"I will defeat the dragon for you do not worry. No man or creature has ever been able to conquer me. However, when I return from battle I want your daughters hand in marriage. She is the most beautiful woman I have ever seen."
The man gladly obliged. He said he would do anything if it meant his daughter wouldn't be taken from this world. So Arthur set off to go defeat the dragon.
Arthur knew he would have to set a trap to best the beast. He gathered a herd of cattle, and he fetched several barrels of wine. He set them out as bait, and he waited. As he expected the dragon came and devoured the herd and drank all the wine. Then the dragon passed out.
Arthur cut off each of the dragons head, and then he cut the dragon into 1000 pieces. He returned to the family and married the daughter.
Author's Note:
I took the story of Susa-no-wo and the eight-forked serpent of Koshi. I adapted it to be in medieval times and our protagonist is King Arthur.