The long, winding stone corridor was silent and meandering, with the sound of droplets of water dripping down the walls in addition to the sound of their own footsteps. The corridor descended downhill, reminding Harry of Gringotts. His heart throbbed, and he remembered the dragons who were said to be guarding the vaults of the Wizard's Bank. If they come across a dragon, a full-grown dragon - Noble is hard enough to deal with: "Can you hear anything?" Ron asked in a whisper.

Harry listened. There seemed to be a soft rustle and clanging sound ahead.

They came to the end of the hallway, and in front of them was a brightly lit room with a high vaulted ceiling. Countless small birds that were as brilliant as jewels flapped their wings and flew around the room. There is a heavy wooden door opposite the room. "Do you say they're going to attack us if we go through the room?" Ron asked.

"Obviously, to find out what these little things do, you have to go through this clearing." Augustus glanced at the unidentified creatures with wings in the air.

Harry took a deep breath, shielded his face with his arm, and sped to the other end of the room. He thought that at any moment there would be a sharp mouth and claws to tear him apart, but he was safe. Unscathed, he came to the door and pulled the handle, which was locked.

Augustus walked over with Ron Hermione, and Harry pulled and pushed, but the door didn't move, and Hermione tried her Alaho Cave spell again, to no avail. "What should I do?" Ron asked.

"Don't you notice that these flying birds overhead are actually the key to opening this door, and if you look closely, you can see that these little things are keys with wings." Augustus looked around the room, while Ron and Hermione stared up at the flying swarm of keys.

"But there are hundreds of keys on there." Ron scrutinized the door's wedge.

"We're looking for a big, antique key — probably silver, shaped like a doorknob." Harry Ron Hermione began to pick up the broomstick next to him and rushed into the dense group of keys, carefully searching for the key to the door.

Augustus opened his Eye of Inquiry and performed a thorough scan of the entire stack of keys, revealing in a moment a large silver key hidden among the keys, wings drooping, as if it had been grabbed and crudely stuffed into the keyhole.

The silver wand pointed at the key with the sky blue feathers, and a mage's hand directed it, and the somewhat listless key was instantly grasped tightly by an invisible hand in the air, and after a few struggles to find it useless, the key was handed to Augustus, apparently accustomed to this rough way.

The three of Harry disembarked from their broomsticks and gathered around Augustus.

"This should be it." Harry asked, somewhat uncertain.

"Try it and you'll find out." Augustus picked up the key, slipped it into the keyhole, and twisted it hard – yes, it was. With a click, the door lock flicked open, and the key flew away again. It was caught twice in a row, and looked emaciated.

"Are you ready?" Augustus gripped the doorknob with his hand and asked Harry Ron and Hermione. The three of them nodded. So, he pushed the door open.

The second room was pitch black and nothing could be seen. But as soon as they stepped inside, the room suddenly became brightly lit, illuminating a shocking scene.

They stood on the edge of a huge chessboard, with black pieces in front of them, all taller than them, as if carved from something like throwing black stone. At the other end of the room, facing them, were white chess pieces. Harry, Ron, and Hermione trembled with fear—none of the towering white chess pieces had facial features on their faces.

"What now?" Harry whispered.

"It's not obvious?" Ron said, "We had to play chess to get to the other end of the room." ”

They saw a door behind the white pieces.

"How to play the law?" Hermione asked nervously.

"In my opinion," Ron said, "we have to act as pawns." ”

"I don't think it's so much trouble, let's just go over there." Augustus had a smile in his eyes. These constructed creatures are quite exquisitely made, but they are only a bit of a deterrent on the surface, and compared to the terrifying trap beasts in the mage towers in the otherworldly realm, these chess pieces are still slightly cute.

The silver wand pointed at the room in mid-air, a huge dark cloud began to form on the roof, as the dark cloud slowly expanded, the entire room was covered by dark clouds, and huge hailstones fell densely from the clouds, falling on the huge chessboard, splashing out clusters of ice crystals, frost on the ground connected and growing together, covering the entire chessboard and chess pieces, and in less than a moment, the entire room became a world formed by cold ice crystal pillars.

Ron Harry and Hermione looked at the Ice and Snow World in front of them a little sluggishly, and they didn't know what to say to express their current mood, in this Ice Country, any language seemed too pale and weak.

"Well, it's easier that way." Ron wiped his eyes vigorously, as if to prove that none of this was a hallucination. Hermione nodded mechanically, not refuting Ron's words for the first time.

"Let's go, I don't know what else awaits us in front of us." Augustus waved at them, and walked first across the mirror-smooth white ground covered in huge blocks of ice, and walked towards the exit ahead.

"What do you think will happen next?" Harry hurried to catch up with Augustus.

"We've passed Sprout's trap, it's the devil's web—it must have been Flitwick who spelled those keys-174—Professor McGonagall had transformed the pieces and brought them to life—and Quirrell's magic was left below, and Snape's," Augustus answered Harry's question as he walked. They came to another doorway. "Okay?" Harry asked in a whisper. "Let's go inside." Harry pushed the door open. A disgusting stench hit their noses, and they had to lift their clothes to cover their noses. Their eyes were also smoked with tears, and through the blurred teary eyes, they saw a troll, even larger than the one they had fought last time, lying motionless on the floor in front of them, unconscious, with a large bloody lump on its head.

"Great, we don't have to fight this troll anymore." Harry whispered. They cautiously straddled the troll's thick legs. "Let's go, I'm out of breath."

He opened the next door, and for a moment the two of them couldn't look at what was waiting for them next—but there was nothing terrible here, just a table with seven bottles of different shapes lined up.

Seven bottles contain enticing liquids that seem to contain an endless amount of mana, each revealing a mesmerizing color.