The King's Sword or the Legendary Sword in "Dragon Quest 3: HD-2D Remastered Edition" is a very useful and powerful weapon in the game. If you want to get the King's Sword, you can go to Alefgor Obtain the important item Olihal Gang from the horse farm in the town of [Domdora] on the German interface.
How to get the Sword of Kings in Dragon Quest 3 Remake
Get the important item "Olihargang" from the horse farm in the town of [Domdora] on the Alefgold interface, and then go to the central residence of the city [Melkid] above the [Elf Shrine] Get the important item "Broken Sword" from the second floor.
Then go to the second floor of [Myra] prop shop and talk to the boss swordsmith, teleport back to [Jipangu] and get the important item "Hammer of Gaia" from the private house on the upper left of the map, return to [Myra] and follow Talk to the swordsmith and finally get the equipment "King's Sword".