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Luck doesn't work? Who told you that? It simply often takes the lower damage value from the range, which even with a 150% bonus doesn't reach the upper limit. But if you're also "lucky," the upper damage value will be taken, and accordingly, the damage will become higher than the maximum. The first Blood skill of the Inferno warrior hero solves the problem of low luck damage. And in any case, luck increases the faction skill of the demons, so it is vital for them.