The Eye is imbued with warpstone energy which can be channelled by the bearer by holding the stone firmly to his head.
Source: Warhammer Fantasy: 6th Edition
Eye of the Horned RatURL Copied!
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Arcane Item25 points
The Wizard can decide to activate the Eye at the beginning of each of his Magic phases. On a result of 2-6 add one Power dice to the Power dice pool. If a 1 is rolled, no dice are added to the pool and instead one dice is removed from the pool.