That is correct, only way to do PvP outside of siege war or the 1v1, 3v3, 6v6, karros canyon, AA, tyfren ect... area. In Taborea zone, only way to do pvp is a duel, both people flag 'PK mode on", or a guild performs a 'guild battle' on another guild. (Which imo should be done more often out of fun as it is currently never used.)