Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Soulstone
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Arcane Item25 points

This gem holds the tortured soul of a sacrificed wizard. If a Sorceress is in danger of losing control of her magic she can feed the captured soul to Daemons to save herself.

One use only. The Soulstone makes the Sorceress immune to the effects of her first Miscast.