A Sphere is a prevalent type of equipment or item in Final Fantasy X and Final Fantasy X-2 created through taking water infused with pyreflies to form varying densities. Spheres and the technology involved in their creation are used for many purposes in Spira, either as recording devices or keys, for save spheres or (in regards to the technology) for creating sports arenas.
in Final Fantasy X-2, Trema stated when a sphere is destroyed it dissolves into pyreflies.
- For a list of sphere items see List of Final Fantasy X items#Spheres.
In Final Fantasy X, characters learn abilities and raise stats by navigating through what is called the Sphere Grid. Each character starts in a different section of the grid and learns skills related to their role in the game by activating "nodes" in the grid. 18 different sphere inventory items are used to activate nodes, clear nodes, unlock barrier nodes, and warp instantly to different locations on the Sphere Grid.
Glyph and Destruction Spheres are used to navigate through the Cloister of Trials, while obtaining spheres named after each temple in Spira is the objective of each temple's Trial.
Spheres are also used as recording devices. Yuna records a sphere for her guardians while on Mi'ihen Highroad. Tidus can discover spheres recorded by Jecht which he left behind for his son to find; finding these spheres also teaches Auron new Overdrives.
Dresspheres act like job classes of previous games, and give unique abilities and appearance to the player characters. Characters can change dresspheres by moving from one location to another on the Garment Grid, in combat (with ) and out.
Search Spheres locate treasures hidden throughout Besaid. Shinra's CommSpheres, placed throughout Spira in previous chapters, are the only means of advancing through Chapter 4, by communicating with people at their locations. Finally, the Crimson Spheres are a type of movie sphere which are also used to open the portal into the Den of Woe.
Tidus's Crystal in Dissidia Final Fantasy takes the form of a movie sphere from Final Fantasy X. It also appears as a special trade accessory that can only be obtained via battlegen when fighting a Friend Card of Tidus, and is used to create the Chicken Knife.
- Tetsuya Nomura proposed the name "spheres" for the Final Fantasy VII Materia system, but Hironobu Sakaguchi thought the name should resonate easily even with elementary school kids, so the term Materia was chosen. It is possible Nomura's original proposition was used for the sphere system in Final Fantasy X instead.