In Star Ocean: The Second Story R, players can upgrade their items to build better weapons and armor for their party. One of the best swords in Star Ocean 2 is created this way: the Eternal Sphere. This is a coveted weapon; players will get the base for it fairly early in the game. Some might be wondering how early they can craft this magnificent weapon that can cut through most enemies and several bosses with just one hit. So it's time to dive into everything needed to make an Eternal Sphere in any playthrough.