Agreed, Prowless can be very devastating to your foes. My last assassin was making over 120 damage from the sword of Argus and about another 80-100 damage from a Main Gauche +2 (12 in sword, gallantry and prowless with both weapons blessed to max).
Prowless will allow you to strike 2-3 times before your ennemy even realizes that maybe he should strike back. If you do heavy damage, he'll be dead before you know it.
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