According to the record of the "Astrana Plane Travel Notes", there is a long wall in a mysterious high-order plane. This wall is complete defense system, including lots of fortifications such as beacon towers. It is commanded and controlled by military command systems as all levels. The wall is located in the northern part of China and is mainly built to withstand the intrusion of nomadic people. Its total length is more than 20,000 kilometers and is therefore called the Great Wall. It is now possible to build another one in the mainland of Erathia according to this.
The Great Wall can be found in the Desert region of the world.
Unlocked by: «acquisition criteria»
| Level | Upgrade Cost | Rank I Total Cost Equivalent[notes 1] |
Effect | Time | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 8× 
|
4× 
|
4× 
|
4× 
|
8×
|
4×
|
4×
|
4×
|
In Space, planet collection efficiency +2% In Space, Class U Energy planet collection efficiency +2% |
Instant |
| 2 | 8×
|
4×
|
4×
|
4×
|
40×
|
20×
|
20×
|
20×
|
In Space, planet collection efficiency +5% In Space, Class U Energy planet collection efficiency +5% |
Instant |
| 3 | 8×
|
4×
|
4×
|
4×
|
168×
|
84×
|
84×
|
84×
|
In Space, planet collection efficiency +10% In Space, Class U Energy planet collection efficiency +10% |
6h |
| 4 | 8×
|
4×
|
4×
|
4×
|
680×
|
340×
|
340×
|
340×
|
In Space, planet collection efficiency +16% In Space, Class U Energy planet collection efficiency +16% |
1d |
| 5 | 8×
|
4×
|
4×
|
4×
|
2728×
|
1364×
|
1364×
|
1364×
|
In Space, planet collection efficiency +25% In Space, Class U Energy planet collection efficiency +25% |
3d 6h |
Notes[]
- ↑ This is the total number of level I materials needed to build the wonder from scratch up to the stated level. Note that transforming those level I materials into the higher level materials also costs some coins.