Acid damage and Bane Fire damage

[Rookierookie]

In theory, if you have some regenerative effects on your troops/mages, you could nullify the effects of acid storm.

With Jomon, for example, you could potentially bootstrap one mage to cast acid storm while another casts mass regen. You can have even more mages boosted to cast blade wind to take advantage of damaged armor. (And while you're at it, those same mages can also cast mass protection to help mitigate the damage)

Not saying it's an incredibly viable strategy, but there are some synergies to go around.