Take the Town Network to Danby Outpost (23.2N, 29.9W), run to the Desert March portal (22.9N, 28.8W), take the Bandit Castle Portal inside Desert March, run to Bandit Castle (66.5N, 49.9E) from the Drop.
Lore & Dialog
Arianna the Adept tells you, "I've always had a natural gift where I was better than my peers at every skill. I could probably share this trick with you but you'll have to give me a blank augmentation gem first."
Arianna the Adept tells you, "Find Fiun Rehlyun on the Halaetan Islands if you need a blank augmentation gem."
You give Arianna the Adept Blank Augmentation Gem.
Arianna the Adept tells you, "Use this gem to gain an extra 5 points to all of your skills. Be sure to read the gem's inscription for further details on its usage."
Arianna the Adept gives you Jack of All Trades.