Visit Zofia Harbor and talk to Foreign Merchant. He asks you to to go to Archanea with him.
There are three battles at Sea Route 2, 4, 6.
You will get 4th Dragon Scale in this battle if you unless you perchase DLC.
At 3, 4, 5 turns, additonal enemies appears. One of White Dragons appearing at 5th turn drops Silver Coin x100.
Foreign Merchant gives you 3x Gold Coin.
You have to defeat Fire Dragon to go further.
After the battle, you can get Sage's Shield.
This part of wall can be broken. You will find Red Dragon and Sacred Wells the off side of the wall.
Battle against a hidden boss character.