The presence of so many tortured souls on the battlefield is particularly disturbing and harrowing for enemy spellcasters.
Source: Warhammer Fantasy: 7th Edition
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As long as the Casket of Souls is on the table, all enemy Wizards suffer -1 on their total Casting dice roll when casting spells. Note that this will have no effect if an Irresistible Force is rolled and cannot cause a Miscast.