Tower of Fantasy has multiple missions/quests that you need to complete for rewards.
It also has side quests, stories, cutscenes, bosses, and more.
The rewards you can get are in-game currencies.
An activity that you need to complete is to find the 6 Ruin B-01 hard chests in ToF.
Obtaining the chests will give you rewards like weapon battery II.
To find them, you need to navigate through the cave.
However, you might not know how to locate them.
In this guide, you’ll learn the 6 Ruin B-01 hard chest locations in Tower of Fantasy.
1. Chest 1

Proceed forward and step on the first pressure plate.
After you’ve stepped on the first pressure plate, the gate to the first chest will open.
Go inside the room and activate the first chest.
2. Chest 2

Pull the lever just outside the first chest.
This will open the gate to the next area.
Go into the next area, go across the moving bridge, turn left, walk up the stairs, and activate the second chest.
3. Chest 3

Go into the next are where you can see a puzzle (containing multiple pressure plates).
Once you’re in that area, immediately turn left and go into the small opening.
Activate the third chest inside the small opening.
4. Chest 4

Go outside of the third chest and proceed to the puzzle.
Now, you need to step on the pressure plates according to the pattern shown in the room where the forth chest is located.
When you do so, the gate to the forth chest will open and you can activate it.
5. Chest 5

Pull the lever in the middle of the staircases to reset the puzzle.
There is a pattern on the wall that tells you which pressure plates to step on.
Step on the pressure plates according to the pattern shown on the wall.
When you do so, the gate to the next area will open.
Go to the next area and you’ll see the fifth chest on top of a platform.
Go up the platform using a relic and activate the fifth chest.
6. Chest 6

Go into the final area near the fifth chest and activate the sixth chest.
The area contains a levitating robot.
Further reading
What is Aida Time in Tower of Fantasy?