Synthesis is a crucial system in Tales of Vesperia that allows you to create new items, equipment, and even powerful weapons by combining various materials. You can access the Synthesis menu at any shop. As you progress, you'll find new recipes, either by talking to NPCs, finding them in chests, or simply by acquiring new materials. Experimentation is key; sometimes, combining seemingly unrelated items can yield surprising results. Prioritize synthesizing new equipment for your party, especially weapons, as they often come with new skills that can be learned. Don't neglect synthesizing consumable items either, as creating your own healing items can be more cost-effective than buying them. Regularly check the Synthesis menu to see what new items you can create.
