The Skaven player is dealt cards from the Winds of Magic deck in the normal manner and these are used in the same fashion as already described in the rules section.

Skaven sorcerers can use warpstone to power their spells as well as, or instead of, power cards from the Winds of Magic deck. The Sorcerer eats one or more piece of warpstone before casting the spell, and each piece counts as a power card.

Skaven sorcerers cannot consume warpstone to reinforce a spell that they are casting or to boost counter magic. Warpstone only provides the power required for spells, it does not provide the power to reinforce spells or boost counter magic.

By consuming warpstone the Skaven is filled with magic energy and power. This is inviting disaster, as not even Skaven can eat warpstone without risking its deadly effects. When a Skaven sorcerer consumes warpstone and before he casts his spell, he must take a Warp test. This determines whether the sorcerer survives eating the warpstone or whether he is overwhelmed by its power and turned into a monstrous mutant Chaos Spawn.