Some war machines, like the Warpfire Thrower of the Skaven, and a few arcane creatures, such as the dreaded Flamers of Tzeentch, use fire as a deadly form of attack. Their attacks will cause double wounds against creatures that are flammable. The flesh of a regenerating creature cannot regenerate if it has been burnt. Wounds suffered from a flaming attack cannot be.
Source: Warhammer Fantasy: 7th Edition
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