The Dementor's howl was not loud, but it carried with extraordinary force. Very few people had ever heard a Dementor scream.
Most people lost the ability to resist the moment they encountered one.
The overcast sky seemed to turn completely black-a deep, oppressive darkness without a trace of hope.
Even the sea breeze seemed to grow colder, while sounds slowly grew muffled and distant.
Through Zhang Xiao's Dharma Eye, everything around him began to lose its color, until the whole world turned black and white.
Dementors in ragged cloaks swarmed in from every direction, and the faint whispers around them grew much louder.
Despite the warm white light enveloping him, Zhang Xiao felt goosebumps rise along his arms.
The warden had already dropped his Occlumency and was watching the sky nervously, wand raised.
A thin, silvery mist sprayed from his wand and shrouded his body. Clearly, he had already cast the Patronus Charm.
"Professor Dumbledore..." The warden turned around. "Are you sure this will be all right?
"I've never seen so many Dementors gather together. They're usually scattered throughout Azkaban.
"With this many Dementors, I doubt an ordinary corporeal Patronus could drive them away."
Dumbledore made a reassuring gesture and pointed at Zhang Xiao, who stood ahead of them with his face tilted toward the sky.
"Relax... let's see how Zhang does first. If he cannot manage, I will calm them down."
The warden nodded, but even with Dumbledore's assurance, he kept his wand clenched tightly in his hand.
People like him found it difficult to entrust their lives to someone else.
There was something else he had left unsaid: Azkaban held too many Dementors for the prisoners alone to satisfy them.
The Ministry of Magic had to send other creatures here regularly to feed these monsters.
All of this