Source: Warhammer Armies Project: Unofficial 9th Edition

Power Stone
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Arcane Item10 points

With a Power Stone, a Wizard can focus the Wind of Magic to cast some of the most powerful spells with ease. Constructing these stones is extremely difficult, requiring an involved ritual known only to a few Master Wizards or Wizard Lords. When a magic user rubs a power stone, the artefact glows for a split second before dulling forever. However, in that moment, the Winds of Magic blow a tempest!

One use only. The Wizard can declare that they are using the power stone immediately before casting a spell. If they do so, +D3 dice are added to the power dice that they are going to roll (you still need to roll at least one dice from the power pool).