Masamune is kind of her ultimate weapon. Obviously, there are two ways to get it. One, through the old man, and two, from the dragon. I should probably put a switch on them so that the Dragon gives something different if you go to the old man first, and vice-versa, especially now that I've learned how to do it. I guess I should probably make the sword weaker and lower the HP on the enemies you have to face.
Also, I failed to point out earlier that in the second maze, you missed a secret area. There's a false wall in the downstairs chest room. There you get the rune blade, which is moderately stronger than the default sword.