Every time you level (twelve sky2 Gold), you get some statistical points, you can distribute any way you want. The system has been for those who are familiar with this but can be a pain for the newcomer to the 12sky2 Gold genre. This game also has another familiar MMO syndrome potion spamming as healing items do not seem to have a cool down at all you can use as much as you want as fast as you want. This makes PvP on an equal level more like Let is see who of us has the most potions today.
You can dual with Twelvesky2 players from your own clan or battle against the other clans with your clan as an ally. Dueling can be fun but if you are both around the same level it all comes down to the potion spamming mechanism. Also when you are fighting against other clans this will happen but then the PvP is not just 1 vs 1 all the time, thus making it a little more fun to do.