After leaving the Tower of Courage, head east and north into a valley. You will have to fight some small groups of Shadow Army creatures on your way, but nothing seriously difficult. After the valley you will find yourself on the edge of a battle plain. There are large groups of the Skeleton Army patrolling those plains, and also some stationary groups, so don't go in too far. Instead immediately head west into another valley. If you hug the left wall you should get there without much fighting.