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Withering Flame, in my opinion, gives +50% damage to Hellfire.
But Hellfire isn't that great of a skill for large armies. Yes, it works wonders when the army is small, but then it becomes irrelevant.
Grol is a Chaos unit, but then you need to focus on spellcasting, which is problematic. Besides, with low spell power, Chaos will be ineffective.
However, the enhanced doggies are tempting...