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From my experience it's quite the powerhouse even without use of souleater. Of course nothing compares to overall power of warrior with combined use of berserk and double attack, however, /drk has it's uses particularly in campaign for fun and zerg friendly fights (ie: BV2, DL, Apocalypse Nigh, etc.)

The only real downside is to keep optical damage throughout use of souleater & hundred fists you need to be curebombed constantly otherwise your damage will take a steep dip down and then you become nothing special.