In Vana'diel, there are many crafters' unions, called Guilds, where the crafters create new items every day to support players. You can join any or all guilds at any time by talking to the guildmaster. By joining a Guild, the crafters will give you some hints for composing items, and help you succeed at composing difficult ones. Here, you can train your composing skill to level up, sell composed items, and buy ingredients you may need to compose items. Here are the different guilds found in the game:
Alchemists' Guild
A union of crafters who create different medicines. These medicines may heal HP, heal MP, or cure status effects. The alchemists' guild is generally comprised of white mages who want to further their curative knowledge.
Blacksmiths' Guild
Mainly, the crafters in this guild are skilled in making katanas and armors. Blacksmiths in Bastok and Sand'oria use advanced technology to create their weapons.
Boneworkers' Guild
A union of crafters who process and work on bones. Helpful items and weapons can be created from bones of monsters. Sometimes the bone of a monster may be magically enchanted. The effectiveness of the bone depends on the monster it was obtained from.
Carpenters' Guild
The crafters in this guild process woods, make wood products and little crafts. Musical instruments, shields, and furniture can be constructed by carpenters.
Culinarians' Guild
A union of crafters who cook and distribute ingredients for their living. In this Guild, they train and seek for better taste everyday. Their food may temporarily improves stats.
Fishermans' Guild
The crafters in this guild go fishing, and make tools for fishing. Fish that are caught can be prepared as food, though Mithra may eat fish raw. Also, rare items can sometimes be found when fishing.
Tanners' Guild
A union of crafters who create exceptional items out of monster skins or hides. Clothing, hats, and capes may be created or strengthened by a skilled tanner.