Blacksmith Hilda:
Very well, then. Defeat the monsters in the Gods' Forge, collect the flames you find there, and bring them to Vulcan. He's mad, but he's a canny blacksmith; he'll give you an S-grade weapon recipe if you can bring him 1000 flames.
You may have heard tell of Vulcan's younger brother Rooney. No? Well, he's as mad as his brother is, and perhaps even cannier as a blacksmith. He's a wandering lad, but he has a lot of different S-grade weapon recipes. Give Rooney 1200 flames, and he'll reward you with an S-grade weapon recipe. If you can find him in his wanderings, it might be a good idea for you to meet with him too.