If you manage to stick with the Assassin class with at least one character until level 11 you will unlock the Negotiate Skill which will cause every shop to lower their prices by 50% when equipped.
Also you will unlock Long-Range Attack at Level 26 which will allow you to attack an enemy even if they are on the Back row.
At level 33 you will learn Double Strike which causes you to hit the enemy twice when you attack causing double damage, link this up with the Absorb HP and Absorb MP abilities from the Sword Master Class and charge attack from the Monk class and you make normal physical attacks one of the best attacks to use in the game.
Hope this helps
Added by: ressurection666 Feb 15th 2009, ID#3981