Goblin forest is the first Field you will encounter in Journey Online and tends to also be the first area new players are battling at. There are 7 stages of Goblin Forest and each stage is harder than its previous pre-requirement.
You can progress through each difficulty level by defeating a stage in the Field and then the next stage is available. When the next stage is available, you can see a number on the stage instead of a lock.
This area is infested by goblin spearmens, goblin gunners and goblin shamans. Each of those has its own role to do while all of them serve the big bad Ogre at the end!