Re: Synchronized Swordsman (PRC)
Awesome, and I love the concept of the paired PrC. It's well put together, quite straightforward, but I'd say a little underpowered. I suggest putting together some interesting additional power somewhere, something in a similar tune with Improved Flanking: being more effective when working as a pair.
Perhaps, a double attack ability where they may both attack the same target and both use the higher of the two attack rolls, or perhaps allowing some kind of co-feint that gives one a huge bonus to hit if the other takes a feint-esque action.
Quote of the [insert timeframe here]: (Week? Perhaps! Year? Also maybe.)
"Those who have learned to walk on the threshold of the unknown worlds...may then with the fair white wings of Imagination hope to soar further into the unexplored amidst which we live."
-Augusta Ada Lovelace
(Kairos avatar by Elrond)