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This article contains plot details from the latest books.
The Point of Purity is where all the Prime Sources of light (starlight, moonlight, and sunlight) converge on the atmosphere at their strongest point. This is where new members of the nobility are taken to take their oaths and be officially sworn in by tradition. Sophie, Dex, Stina, Biana, and Wylie were taken here when they agreed to officially become Team Valiant.
The Council travels to the Point of Purity on a yearly basis, to remind themselves of the power of unity while having differences. It is revealed in Legacy that the Council had visited the Point of Purity before Sophie's arrival, for they knew that it would be a world-changing decision.