Pieces of refined warpstone are consumed by power-hungry Skaven Wizards.
A Wizard may purchase up to three Warpstone Tokens, each of which is single use. Before making a Casting roll, a Wizard may choose to consume a single Warpstone Token. For each Token consumed, they may roll an additional D3 and add its result to their Casting roll. However, for each natural 1 that is rolled, the Wizard loses a single Wound.