Enemy list
Chest list
Hidden items
From the Dwarven Hollows, get on your ship and sail back through the enclosed sea toward the south. You'll spot a small town east of a mountain range; that's Tokkul. If you walk southwest of Tokkul into the desert, you can actually see Castle Hein floating in the sky, though you can't interact with it from here.
Create a save file before entering town. Everything inside the next dungeon is permanently missable (all 11 chests, 1 hidden item, and 5 bestiary entries disappear after the boss), so you'll want a fallback in case you miss anything on your first pass through Castle Hein.
When you enter Tokkul, a cutscene plays where your party is paralyzed, ambushed, and dragged off to Castle Hein. Hein was once King Argus's most trusted advisor before he went rogue, uprooting the Elder Tree itself to carve out this floating fortress. Five new bestiary entries appear inside:
Castle Hein
The dungeon spans five floors with 11 chests and 1 hidden item total. The video below walks through every chest location if you'd rather follow along visually:
1F. You wake up in a jail cell with a few soldiers. The dialogue here explains that the castle is carved from the Elder Tree and that Hein has hidden the Royal Sword somewhere inside. Talk to the soldier against the left wall (the top one) to receive Mini (Hidden Item 21/61). If you need to heal, interact with the pot in the bottom right corner of your cell. Then cast Mini on your party and squeeze through the hole in the top left wall to escape.
2F. Cast Mini again on the next screen to return to normal size. Follow the path south and pick up Chest 1 (Holy Arrow, 111/367), then continue west until you see tree roots curving inward along the wall. Walk through them to reveal a hidden passage.
Before going up the stairs, grab Chest 2 (Phoenix Down, 112/367) sitting nearby. Then climb to 3F.
3F. You'll see a long hallway with 3 doors in front of you, and each room contains treasure. Start with the leftmost door: Room 1 has Chest 3 (30 Gil, 113/367) and Chest 4 (100 Gil, 114/367). None of the enemies in Castle Hein pose threats you haven't seen before, but Dullahan hits hard, has high HP, and is the rarest spawn in the dungeon. Pace around Room 1 until he shows up; it may take a few minutes, but this is the most reliable spot we found. Log him in the bestiary before moving on.
Room 2 (the middle door) has Chest 5 (3,300 Gil, 115/367) and Chest 6 (3,000 Gil, 116/367). And Room 3 (the rightmost door) contains Chest 7 (Phoenix Down, 117/367) and Chest 8 (Zeus's Wrath, 118/367). Your chest count should now be at 118/367.
Exit Room 3 and go up and around until you reach a door leading north. Behind it is Chest 9 (Royal Sword, 119/367), which is a solid weapon upgrade for your physical attacker. After collecting it, go left through a hidden passage in this room to find stairs leading up to 4F.
4F. Progress north along the path to collect Chest 10 (Phoenix Down, 120/367), then take the stairs in the bottom right corner of the map up to 5F.
5F. Don't go through the door right away. There's a path on the right that leads north to one last chest, Chest 11 (Elixir, 121/367). Once you have it, all 11 chests and the hidden item are accounted for. Before you step through the door to fight the boss, make absolutely sure you've registered every bestiary entry (066 through 070) and collected everything. There is no coming back after the next fight.
How to Beat Hein
Once Hein falls, a cutscene transports you back to the Living Woods where the freed Elder Tree grants you the Fang of Wind, a key item you'll need at Castle Argus to upgrade the Enterprise airship.
To heal from Hein's corruption, the Elder seals off the fairy forest for 1,000 years, which makes the Living Woods permanently inaccessible from this point forward. You'll be dropped back on the world map with Castle Hein gone for good. Walk south toward Tokkul, which you can now explore freely for its 2 chests and 5 hidden items.
Tokkul
There are no shops in Tokkul, but the town has 2 chests and 5 hidden items scattered around. The video below shows every pickup location:
Go north from the entrance and over to the east side of town. You'll see a patch of grass; face south and interact with it to collect Hidden Item 1 (Ice Staff, 22/61).
Now walk to the west side of town. In the bottom left corner you'll find a small dead end containing Hidden Item 2 (Bacchus's Cider, 23/61).
From there, go north and you'll find Hidden Item 3 (Hi-Potion, 24/61) in the grass nearby.
Cross over to the north side of the house. Between the trees you'll see another dead end with a grass patch; interact with it for Hidden Item 4 (Lamia Scale, 25/61).
Finally, enter the furthest north house in town and walk through the fireplace at the top to reach a secret room. Check the pot in the bottom right for Hidden Item 5 (Sansetsukon, 26/61), then open the two chests nearby for a Kenpo Gi (122/367) and a Phoenix Down (123/367).
With all 5 hidden items and both chests collected, you're done in Tokkul. Exit to the world map and continue to Castle Argus, where the Fang of Wind will let you upgrade the Enterprise.