Unfortunately, you're now on board of the Ghost Ship (as mentioned in Baysel). You must now fight out of the ship. Since the ghosts inside the ship is quite hard to deal with, do try to avoid direct contact with them. Some small rooms will even have a ghost selling items to you (but you must "clean" this room first - beating all the ghosts)
You will find a library-like room during the journey. A bookshelf inside contains three book, namely "BLOOD", "DEAD" and "NOROI". See the books according to this sequence : BLOOD, DEAD, NOROI, DEAD. Then the shelf will disappear. You'll find a diary written by the captain. What's inside: "DEAD DEAD DEAD DEAD DEAD DEAD DEAD DEAD ......" Suddenly you become a ghost. Your other two supporting character will do the rest of the journey. When you reach outside, you'll meet a very big ghost.
Boss time again. It's quite hard to deal with this boss just with 2 people. If you've got Light Magic attacks (Angela will have it), use it. Do watch out your HP (I'm nearly dead just after I beat it). After beating the big ghost, you'll come out. Then the Spirit of Darkness will also come out. It says that the Mana Stone of Darkness is missing, and so it doesn't have any place to live until it was captured by the big ghost.
Then the Ghost Ship disappears. You all fall into the sea until you reach a very strange island.
The Volcanic Island
This is the Volcanic Island. The Volcano on it will erupt soon. You gotta get out of there quickly. Soon you'll see a giant torture entering a cave. "What's that thing?" you wonder.
There's a villege inside the inland, with a small inn and some shops. You can't find any human inside the island (even inside the villege. It's Indian-like tents lived by monsters). Inside the villege, you'll hear some important information. "You've saw the torture? Great, maybe it'll help you to escape from this island. Unfortunately, the entrance to the cave it lives is blocked by rocks."
Go to a cliff where there's a rock blocking something. Go near the rock and cast the Spirit of Earth. It'll move the rock away. Enter the cave, and go on until the end of the cave. The Earl of the Evil Eye waits for you there. He intends to fight with you, but the volcano begins to explode!
"You'll surely be killed by this erumption, ha ha ha ......!" then he disappears. There's no way out. Suddenly, the giant torture you've met appears. You ride onto the torture, and it swims out of the cave. It goes to a beach near Maia, and you land on there.
"Let's go to Forsena to see how we can find the remaining spirits." you say. Then you go inside Maia, and use the Cannon House to fire you to Forsena. The landing position is corrected this time. You enter the palace, and report what you've done to the Heroic King.
"What? You've got 4 Spirits? Well done, you all. Now I'll tell you where the remaining ones are: The Spirit of Water is inside the Snowland near Artena. The Spirit of Fire is inside the Mountain of Flame near Nabaal. The Spirit of Moon is inside the Moonlight Forest near the Beast Kingdom. The Spirit of Wood is inside the Lamp Flower Forest. Go to get them and open the gate to the Mana Sanctuary. I'll also give a flute to you. It can call the Seamaster (the name of the big tortune) and it'll help you to go to the above places.
Open the treasure box next to the Heroic King (REMEMBER to empty one item on your circular menu), and fire back to Maia. Go to the beach near Maia, and blow the flute. Seamaster will appear, and you'll ride on it. You can now control it. The places you gotta go is highlighted on the maps, so it's easy to locate them. Firstly, you should either go to the Snowland on the Morthwest or the Mountain of Flame on the Southeast (you'll need these two spirits to find the remaining ones). I've chosen the Snowland as my first place to go.
That's all this time, folks