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A rend deals extra slashing damage equal to the sum of damages from your two weapons. So effectively a 40-50% chance to deal double damage if both your attacks hit. You strike out at An angel! Your double strike XXX DISINTEGRATES XXX An angel for 235 damage! Your double strike does INSANE damage to An angel for 399 damage! You bury your weapons deep in An angel, then rip them out sideways! Your rend does BLASPHEMOUS things to An angel for 644 damage!