My guess is it's a typo if it's 10%. It's actually better if it's physical damage because mdef in Origins is massively higher than pdef.
I'm unsure this will still really work for PvP, though. Attack force values are likely going to be around a quarter of what we had in R:BF from the fact that str/dex/int have .6/1/1 scaling rather than 4x across the board. We'll see if it gets fixed post-beta. I'm hoping it does, as int dekan is fun.