These pieces of refined warpstone are consumed by power-hungry Grey Seers or Warlock Engineers to aid their spellcasting. This is dangerous, but the quick road to power is an irresistible pull for any Skaven.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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A Wizard may choose to eat some warpstone to boost his powers. Before casting a spell announce which model is eating Warpstone Tokens. Each token can only be used once. For each token consumed, a Wizard can add an additional power dice to his casting attempt. This does allow users to roll more dice than is normally allowed by their level. A spell may be cast entirely with Warpstone Tokens if you wish. However, for every Warpstone generated dice that rolls a 1 the Wizard suffers a Wound with no saves allowed.