Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
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Lightyear (ライトイヤー Raitoiyā) is one of Saïx's weapons in Kingdom Hearts 358/2 Days. A lightyear is the distance light travels in one year. The distance is roughly 5,900,000,000,000 miles.