[Zentar]

Sombre said:
Well the idea behind warplightning is that despite the way it appears in the game, it actually jumps from the caster to the target, not from the sky. Unlike regular lightning or weather magic, warpstone is the power behind warplightning, which is essentially just a release of warp energy. I decided early on that warpstone based magic was a mixture of fire/death/earth in dom3 terms - earth/death is the poisonous aspects of it, fire/death is the warpfire and earth/fire is the raw warp energy or warplightning.
Besides that the earth and fire spells native to dom3 all make sense more or less for skaven warlock engineers to be using. The air spells don't fit them at all. Like Agartha they're largely a subterranean race and weather magic isn't their bag.
Ikkit Claw has air magic because he's travelled all over the world collecting arcana. He's a hero available to Skaven. One of the strongest heroes in the game I'd say.

Wow, thanks for the insight. It makes sense to me now.