The Definitive Dark Knight Guide

[Giantbane]

It does a great amount of damage for what it's worth, but I agree that it costs WAY too much. DA+DP = Half MP gone. Usually best to do it when you have multiple mobs and Blood Price is up though so you can at least get that MP back. Outside of that, I personally just stick to the other AoE that we get(name escapes me).

I think that's actually the only time it should be used, in an AOE situation where you can get the mana back via blood price.