The Forge is used to Forge Ingots into Equipment, Fletch arrows for your ranged stance, and train forging.They are located in each of the major cities. Fira, Ramoria, Alexandria, Darkhaven, and Pirate Island. You can also get one in your house with a high enough housing level.
Used to Create Equipment for your hero. See Forging
Used to create Arrows for your Hero's ranged stance (adds 300-400 range and extra damage). See Fletching
Converts all of your ingots into Forge experience, but produces nothing. Useful when you just want to level your profession.