Anyone who think they can win against this army?

[Graeme Dice]

Originally posted by DLC:
the spell "storm" removes everyones flying ability except storm demons,

In a storm, only Storm Demons, Pazuzu, the Queens of Elemental Air, Air Elementals, Caelum Storm Guard, and Storm Generals can fly.

wrathful skies works wonders on manikin or mandragoras i'd think, those storm demons have perfect accurancy due to aim +5 and the storm not affecting their aim. 5x10 shots of lightning + whatever spells the vanadrott casts.

Your army is extremely vulnerable to anything that can reach it quickly, like heavy cavalry. Ermorian hordes are not a good test for this. Mandragoras would work also quite well, since they have enough hitpoints to survive a single lightning strike.