To unlock the Elf job (Considered one of the best in the game) go to Galados Isle and head to the east-most point of the map until you reach a locked door. Now go to the nearest chest from the door. This area contains the tablet to open the door. Now open the door and go into the newly opened portal. To even stand the slightest chance in the forest... You must have a level 25 party and a very strategic plan. Make it through the forest and fight through the hoards of enemies (Having a cleric with righteous anger will make these fights easier). At the end you should reach the area where you finally get an Item that gives you the Elf job.