Exsphere

An Exsphere is one of the main themes in Tales of Symphonia. Exspheres serve as power-enhancers for the party and their antagonists, the Desians and ultimately Cruxis.

Originally exspheres were thought of to be simply objects that increased the user's fighting and survival potential far beyond their maximum limits. However, it is learned in Kvar's Human ranch that Exspheres are made by Desians by cultivating humans, turning them into exspheres. This revelation almost caused the Party of Regeneration to discard their Exspheres, however, Kratos convinced Lloyd otherwise.

The party later found out that exspheres were not just in Sylvarant, but in Tethe'alla as well. Most Exspheres in that world were mined in the Toize Valley Mine, though their origins were the same. Most people with exspheres the party meets in Tethe'alla were given them by the Renegades, or Vharley.

Although in certain endings of the first game, Lloyd and his soulmate intend to work together to collect and dispose of the remaining Exspheres in the world, several characters appear to still be wearing theirs in Tales of Symphonia: Knights of Ratatosk (most likely to serve as a reminder of what Exspheres are capable of).