[Valerius]

We will learn to fear Ashdod! Umm, I mean Agartha.

So the reactions to Darkness range from concern to ambivalence. NooBliss are you ok with removing Darkness but leaving Iron Bane and Earthquake in? You'll still have two spells you can use better than anyone. Other options that come to mind are increasing casting requirements/gems for the spell or having a fixed duration to it (I should be able to mod it to only last a given number of turns).