The Eye is imbued with warpstone energy which can be channelled by the bearer by holding the stone firmly to his head.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Eye of the Horned RatURL Copied!
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Arcane Item15 points
The Eye of the Horned Rat may be used at the start of your Magic Phase. Roll a D6, on a 2+, add one dice to your power dice pool. On 1, remove one dice from your power dice pool.