Bloodstones

This dark, red-veined rock is about the size of a clenched fist. It feels slightly warm to the touch.

Unlike many magic items, Bloodstones are not unique; they are granted by Khorne as Rewards. Many Champions of Khorne have won the field with these terrifying stones, used to allow those who crush the stones to summon Daemons to face down spellcasting foes.

Source

 * Warhammer Fantasy RPG 2nd ED -- Tome of Corruption
 * pg. 180

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