Assasin

@Face2Face can assasin farm solo at all maps? hehe

with some "technique" you can mob alot and damage them without getting hit too much.. and their skill gives much damage with stealth.. that can handle bosses somehow :D

shadow or attacker is also good.
if your finger is fast..with S medal equipment and a decent Attack arm and a blade.. you can make a fortune.

assassin is good but only 1 attack skill.. boom..only boom...you boom miss..you have to pray and keep finger cross..
shadow ofc..have Boom +( bash )/hard hit and also have needle split + dispel if for pvp..while assassin only have boom..only boom to damage people..and maybe some needle spit.. boom miss..then u wait for dead.

attacker also good, u have many skill, Shockwave, Bash + Drain life ( heal 50% > 100% HP ) all of this skill got slow effect..so pvp time u are 2nd to god if you are at public map farming / Lvling. and if you are poted and with full buff 1 attacker vs 3 warrior.. your chance of winning is 80%.
minus or plus a bit ..stat of weapon and armors...about the same stat..u don't have to be afraid..even when u use S mall item ( armos ) and your opponent is using AAA+5 potor set..your chance of winning is still higher then 50%.