Source: Warhammer Armies Project: Unofficial 9th Edition

The index is currently displaying version 2.2. The index will be updated to version 2.3 at a future date.

Ultimate Power
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For every natural 6 rolled when casting a spell, you automatically have to roll an additional 'free' power dice to boost the casting value even further. Note that any 6's rolled on these additional dice do not count towards Ultimate Power. These additional power dice are not deducted from the army's power pool, nor are they limited by Wizard level.

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