Make sure you have a character with the ability to use knives. Go southeast of Dourbridge, in direction of Zere Rocks. Before entering the forest that leads to Zere Rocks, talk to Odval. She will give you the "Ranger Changer" quest. This quest is very easy. Use the ability "Toxic Dagger" to poison a given amount of Hocus Chimaeras. Let them die by the venom, and not the other attacks. They each have about 70 HP in the following forest; try to calculate the hits you give them then use Toxic Dagger. After defeating the given amount of Hocus Chimaeras, return to Odval. You will now have access to the Ranger vocation.