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Tethe'alla is the other world in Tales of Symphonia, parallel to Sylvarant.

The flow of mana is controlled between the two worlds. The music in Tethe'alla is different than Sylvarant's, where the music is more rock and adventurous. Tethe'alla is the world receiving the mana flow which is why the cities are advanced in magitechnology.The world of Tethe'alla is fairly different than the world of Sylvarant; they have a king who rules over the land, elves are still alive, and half-elves are at the bottom of the caste system. Tethe'alla also still has the ability to summon, something that has been forgotten in Sylvarant. The party first arrives in Tethe'alla after the first visit to the Tower of Salvation.