Aion Assassin PvP
Aion Assassin PvP is highly suited to the solo player, as they are the least reliable on being in a group to be effective in PvP. Aion Assassin, like many rouge type classes in mmorpgs can sneak around without being seen, and striking the victim when they least expect it. So running around in a group, announcing your presence is not very beneficial to the style of gameplay of Assassins. Most Assassins who do group, tend to form groups with other Assassins.
If done correctly, Assassins can obliterate some classes very quickly, especially Clerics and Chanters. So if Assassins are in a large scale battle, these are the classes they should be killing first. Clerics taken out early on, can turn the tide of battles, since after losing the healers, the remaining enemy classes will fall very quickly.
To be a great at Assassin PvP, you need to know the three main advantages of Assassins. These are stealth, stuns and damage. Stealth is somewhat obvious capability, though it's is not as overpowered as in other games, since it can only last up to 50s and has a 1 minute cooldown. But is it still good enough to orchestrate a well planned ambush. However, watch out for other Assassins in the area, as they can see you, unlike other the other Aion classes.