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

Luckstone
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Arcane Item10 points

Charged with divinatory power, these stones are very useful when a Wizard is manipulating the delicate balance of the Winds of Magic. Those that carry the Luckstone are said to cheat fate, for a time at any rate.

One use only. The bearer can re-roll all of the dice rolled to cast or dispel a spell. This can effectively cancel a miscast result, and cause Ultimate Power or a miscast.