Demon Suppression Tower.
A realm where the Heaven Patching Sect suppresses malicious demons and disciples who have violated the sect's laws.
Those who qualify to be locked inside are at least at the Divinity Transformation level; legends say that an ancient demon of the Return to Void realm is suppressed at the bottom of the tower.
Thus, the Demon Suppression Tower is unlike common mortal prisons; the demons imprisoned have enormous strength, and it's unpredictable when they might break through the restrictions. If they escape, they will surely first slaughter the prison guards to vent their anger, then be suppressed again by the sect's ancient ancestors.
Zhou Yi wouldn't dare get anywhere near such a perilous place.
"Thank you, Master, for pleading on your disciple's behalf."
