Cathayan Jet

Cathayan jet is used to make finely crafted pendants, bowls, rings or other trinkets, which protect their wearers (often, well-travelled Ogres) against all forms of hostile magic, except for High Magic, Dark Magic (both considered sacred and described as ying and yang in the East) and Gut Magic.

Source

 * Warhammer Armies: Ogre Kingdoms (6th Edition)
 * pg. 63

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