Advice for Abysia against Niefelheim

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Did you try burning them to the ground, with packs of Anathemants and Anointeds casting Fire Clouds, Falling Fires, Fireballs and so on ?
That with a solid Abysian inf screen could be effective, the Abysians don"t take damage from stray fireballs. As you're playing EA the Burning ones are very tough and hit hard enough to kill giants I think - but they're sooo costly they need some bless strategy to be worth their cost IMHO.