Assassin, AKA Sin, while despised as a thief, but it is actually a very useful class to have in your team. Your main goals? Simply to stay stealth, ambush and poison anything in your way. Assassins best known for their speed, hiding abilities and their extensive evasion skills. One specific skill is being capable of Engraving Patterns on enemies, which not only damages, but debuff status the enemies.
Fighting as an Assassin
Soloing as an Assassin
When fighting as an Assassin, the key word is "Damage Dealer." Whether you are fighting alone or in a group, Damage Dealer is still your role. During solo combat, you need to hit hard and fast and at the same time keep the enemy stunned. If your rapid combo fails, start retreating.
Assassin in a Group
Group fighting while similar to soloing, the difference is that you got your team mates to back you up. So less running away and less being cautious with your health. Again, your main key word to your fighting strategy is "Damage Dealer." Backing up your group with a good set of combination skills to increase your group's chances of winning.
The assassin's secondary function is to act as a scout and the coward. With its ability to hide and stay stealth, infiltrating enemy territories is not impossible anymore or casually scouting new path ways. Coward is self-explanatory, just run for it when danger creeps up on you.