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“Which is why it is sealed in this case made of 'clearstone.' The hardest substance known to human. Impenetrable by any living...”
Dr. Saunders

Clearstone is the hardest substance known to man. It is what the case for the Yin Blade is made of. Ghosts are able to go through it.

History

Day of the Departed

Dr. Saunders tells the Ninja that the case for the Yin Blade is made of solid clearstone. Cole is able to reach through the clearstone and grab the Yin Blade.

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