Hero Sealing Tower (Cha)

Cha Hero Sealing Tower is a place where FUG ancient war hero Cha was sealed.

About
Cha Hero Sealing Tower is located on the Wall of Peaceful Coexistence (Peace Council) on the 52nd Floor. The Sealing Chamber of Cha were actually guarded by several Rankers, but during the ambush of Toro (Cha's servant), there is only one Ranker guard named Kehellman because the other Rankers were guarding the outside wall of Peace Council.

The Hero Sealing Tower is a special structure built by the Zahard Empire to contain, prison, or seal FUG powerful ancient heroes in the Tower after the great war of the Age of Genesis. This structure can seal a High Ranker. The war heroes that are trapped inside are not dead, they just experience deep sleep and can also be unsealed.

Seal Rules
In order to break the seal, only one friend, family, or acquaintance shall become the key to open the seal. If the person who become the key dies, the trapped heroes can't be unsealed forever. To become the key, a person must sacrifice something. The severity and price of one's sacrifice differs from one person to another. Ranker Toro is required to sacrifice his life along with Cha's blue gem.

History
After FUG lost the war against the Zahard Empire, people from the Peace Council had to migrate or moved into this wall as part of the agreement between the rebels (FUG forces) and Zahard Empire forces to achieve peace. This wall is also had to be built by the rebels and had to be placed within the territory of Zahard Empire.

After Dowon was sealed at the other wall, Cha was deeply saddened. He left the Hidden Grove team and went to go on a rampage, killing several Rankers of the Zahard Empire before requesting to be sealed himself in the wall controlled by the Peace Council.

Thousand of years passed after Dowon was sealed, the Zahard Empire finally decided to break the peace agreement after they suffer a big loss in the Battle of The Last Station and the other fact that the former Army Corps Commander Kallavan failed to assassinate the Irregular Twenty-Fifth Baam. Afraid that Baam will start to spark FUG's long lost, forgotten spirit, and awaken all FUG war heroes, Princess Adori Zahard quickly ordered Zahard Empire Military to either "kill" or "persuade" the sealed heroes to join the Zahard Empire.

The entire 5th Army Corp and its Army Corps Commander Lo Po Bia Yasratcha was assigned to persuade the Peace Council. While the 5th Army Corp are busy negotiating with the Peace Council, at the same time, one of Cha's servant Toro decided to quickly launch an ambush against the sealing tower guards. Toro then said he must unseal his Lord Cha because Cha is the only one who can save their wall. In the end, Yasratcha failed to either kill or persuade Cha to join Zahard Empire because the Zahard's Army Military Headquarter suddenly ordered the entire 5th Army Corp to retreat.