Normal: "A hodgepodge of various fiends with an impressive array of abilities. It cycles through attacks corresponding to each of the four primary elements. Not too shabby." Oversoul: "A hodgepodge of various fiends. It uses all sorts of attacks, but when its HP gets low it loses those abilities. Seriously borked." — Scan
The Rhyos is an enemy in Final Fantasy X-2. They are semi-powerful and should be dealt with first before any other enemies. Using strong attacks is preferred, as is setting up Protect and Shell to reduce the damage they can do.
In the Fiend Tale endings, one notable Rhyos was created from the spirit of Bevellian inventor who played a role in the development of Yevon's machina and the Shoopuf saddle. However, the genius inventor was killed by one of his own creations and was reborn a fiend who now creates machina to solely benefit others.