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Crystal veins, originating from the Crystal of Truth in the Castle of the Crystal, spread throughout Thra and deliver life to all things. Normally clear and bright, the Crystal veins of Thra have become ill. In their blight, they turn dark and purple, and contact with them causes madness and rage in the usually peaceful creatures of Thra.[1]

Crystal veins are also a gentle light source in the Caves of Grot, dimly glowing blue and white. They gently light up the caves along with the abundant glow moss.[2]

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