yasnikov
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To be honest, I didn't quite understand what you meant. Either Fire Wrath (which requires skilled Chaos and provides a 10% damage bonus), or Withering Flame (which requires strong Chaos and enhances not the damage of creatures, but the damage bonus, specifically increasing the damage from "hellfire" by 50%).
Yes, I was wrong, I admit it. Indeed, I meant Withering Flame, and it really requires level 4 and provides a +50% bonus not to the total damage, but to the damage from "hellfire." So, I take back my words about the usefulness of Chaos for a demon.
But Light is really useful for a demon, as it is for everyone else, except for the undead. But for demons, it is even more relevant, since almost all units have a large range between minimum and maximum damage. Therefore, mass divine power is a must-have for a demon. And mass punishing strike or mass stone skin (whichever you prefer) is also very good. It's a pity that it is almost impossible to get Light without a hut.