From what I hear from other players, they aren't worth much in terms of the damage they add/heal. But a popular use is against mobs like Key Keepers in Forgotten Underground Temple, with defense that's so high that you otherwise only deal 1 point of damage. Attack forces add the damage indicated, so these types of creatures can be killed much quicker when using attack forces.
The car's on fire and there's no driver at the wheel And the sewers are all muddied with a thousand lonely suicides And a dark wind blows
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And the sewers are all muddied with a thousand lonely suicides
And a dark wind blows