C1750 Blocking Break
The Blood-red Curtain, as a secret sealing technique of the Old Twelve Clans, had to be unsealed to break the seal on the Blood-red Curtain, both internally and externally. The person who laid the formation had to unseal the core of the formation.
As for the Blood-red Curtain of the Heaven Gate City, they were presided over by the number one Deputy Chief, Suo En