Make sure Abbot Jack of Alltrades is back to the Alltrades Abbey. Go inside the abbey. Near the entrance, you will find a person with a red hat (Windy). Talk to him. He will give you the "Elementary Training" quest. This quest requires a lot of patience. You must defeat a certain number of Metal Slimes, but with a character that has used the ability "Wizard Ward". It must be that very character that delivers the final blow. Up to this point, your characters are probably very good levels and the Metal Slimes will always flee. To keep them in battle, you need low level characters. Use two new level 1 characters made in Stornway and have them die. You can find Metal Slimes at the Quaratomb, west of Coffinwell. If possible, try to get two characters dead, and the other two characters with low health. Engage any Metal Slime you encounter, and use Wizard Ward as soon as possible. Have the other character defend for the rest of the battle. Next, simply attack the Metal Slime until it dies After you defeat the given number of Metal Slimes, go back to the Abbey and talk to Windy. You will now have access to the Armamentalist vocation.