Final Fantasy X/X-2 HD Remaster · Stat sphere
HP Sphere
The guide lists an HP Sphere as adding 300 Hit Points and associates it with the Ironclad Arena fiend.
How it works
The guide’s stat sphere table gives HP Sphere a +300 Hit Points increase. It lists Ironclad as the associated fiend and says it is unlocked by capturing 10 of each Iron Giant-type fiend. These are details in the guide’s late-game Monster Arena table; it does not give a complete account of other possible ways to obtain the sphere.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.