King of The Tower Contract

"Zahard became a King due to a contract"

- Author SIU

King of The Tower Contract (영생계약, Yeongsaeng Gyeyag) is a special Contract between Zahard and the Administrators that proclaim Zahard as the official "King" of The Tower.

In the webtoon, Ja Wangnan mentioned that Zahard has a special contract with the Administrators that protects him from harm; none of the inhabitants of the Tower can kill him. As a result, he can be killed only by an Irregular.