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The Triforce

The Triforce is the most powerful treasure on Hyrule. It is made of three pyramids with different colors, each of which is inscribed with a stylized letter and represents one of three virtues: Wisdom (blue), Power (red), and Courage (green).

The Triforce is connected with Princess Zelda's life force. If any of the three pieces of it are separated, she will grow weaker and weaker until she dies.