Gah..yup yup I meant Serene Symbol. And in PvP, you can attack any con you want, except grey - they have to attack you first. If the grey con player attacks you, you con red to them. Some of the best, most rewarding fights have been my group at 55 killing 70's.
They have changed the mechanism a little to make that much harder. One of the only ways some higher level people can get enough faction to get PvP gear is to 'farm' grays - meaning they use exploits of some kind to get the grey to attack them. When this happens, it is even sweeter when you kill them, instead 