Felix saw a hazy green light. He squinted his eyes. The green light came from a stone basin similar to a pensieve, with a base connected to the bottom.

Under his feet were clusters of crystal-like stones, messily inserted upside down on the ground, reflecting a faint light. Felix looked around. The surroundings were dark and lifeless.

Sirius helped Kreacher up and raised his wand high. The light on the tip of his wand could only illuminate a small area. Even half of his face was hidden in the darkness, making it difficult to see his features.

"We have penetrated deep into Voldemort's heart." Sirius said quickly, with a little excitement and pleasure of revenge in his tone: "But the impact here is greater, and magic doesn't work very well."

"Some magic doesn't work," Felix tilted his head and motioned him to look at Kreacher next to him. The fingertips of the house elf lit up with a brighter light, "This also gave me some inspiration..."

Felix extinguished the light of his wand and completely merged into the darkness. They were only a few feet apart, but Sirius could not see any outline of him. The surroundings were so quiet that it made him feel uneasy, and the feeling of danger was getting closer and closer.

He heard Felix making strange sounds, like some kind of language, with a strange rhythm and rhythm, and then he saw light. A large amount of soft milky white light bloomed in front of his eyes, leaving an insignificant little dot in his eyes, but in an instant, the light poured down, covering the earth, the air, and filling every inch of space within his sight.

The light was not dazzling. Sirius could even look past Felix and see the scene behind him. He couldn't help but open his mouth wide - it was an endless, smooth lake like a mirror. He subconsciously ignored this place before. The lake was hidden in the darkness, calm and without a ripple or sound, just like a flat open space.

But the most surprising thing was what was in the lake, a corpse! Corpses were floating one after another under the mirror-like lake. He looked around. The nearest corpse was only three or four feet away from him, as if he could touch his feet with his hand.

Sirius could even see the pale faces of the corpses, which were soaked like marble. They were wearing brown tops and blue or black pants... Sirius' heart turned cold. Regulus might have been dragged into the water like this...

"Splash!"

The dark lake water stirred up waves, and a hand reached out, "Be careful! These are not corpses, but the army of Inferi created by Voldemort!" Sirius stepped back and warned loudly, "Moreover, many of them are Muggles... Damn, it's that village! In order to get soldiers, he destroyed a village!" Sirius

didn't have time to curse, he raised his wand and prepared to fight back. It was not an easy task to be careful not to accidentally hurt Regulus's body while being restricted.

But Felix said calmly, "It looks like they don't intend to attack us." Sure enough, the Inferi did not climb onto the island in the middle of the lake, but kept moving away from them, or more precisely, away from the light source in Felix's hand.

"Fear of light and fire are the characteristics of the Inferi, and Voldemort will definitely restrict these two types of magic. In addition, they cannot Apparate, which is really a good move..."

Felix said, "But just like he didn't consider the magic of house elves, Voldemort didn't consider the ancient magic that relies on runes. Of course - maybe he considered it but couldn't restrict it."

Felix raised his hands and let a round white ball of light rise slowly. The cave they were in was very high, and they couldn't see the top of the cave when they looked up, so the white ball of light simply rose to the highest point, like the sun, shedding warm light. The

dark trap designed by Voldemort failed. The light and darkness were entangled together, and finally drove away the darkness, and the whole cave was as bright as day.

At this time, they also saw everything around them clearly - they were standing on a small island in the middle of the lake, surrounded by a large area of ​​black lake water, but the black lake water had been illuminated to be transparent and shiny.

Hundreds of Inferi were hiding at the bottom of the lake, but they had nowhere to escape and just hid themselves by instinct.

Felix said to Sirius and Kreacher, "You can find someone now. I want to study this stone platform." After a few seconds, he looked at the man and the elf and asked in surprise, "Do you need me to cast a Bubble Head Charm on you?" The

Bubble Head Charm can create a bubble in the shape of an inverted fish tank above the caster's head, allowing wizards to explore underwater or avoid unpleasant odors. It is not a rare magic. As far as Felix knows, the Weasley twins are quite proficient in this magic.

"You won't let me join you in the search, I don't know Regulus..."

Sirius waved his hands. He spent a lot of effort to cast the Bubblehead Curse on himself and Kreacher, and said in a dull voice: "Are you sure these Inferi won't suddenly attack?"

"As long as they are still Inferi." Felix scanned the area with a black and white perspective, "I don't see any hidden magic, don't worry."

Kreacher immediately jumped into the lake, swimming flexibly with his limbs. Sirius muttered something and jumped in as well.

Sirius endured the icy cold water, his vision was not affected at all. He first found an Inferi hiding behind a reef, pried open the Inferi's hands covering his face, and tried to see his appearance clearly - until Sirius started looking for the next target, he was not attacked by anyone.

"Perverted magic." Sirius said in the lake. Inferi are afraid of light, but ordinary light does not have this effect.

What happened next became boring. Sirius stayed in the Black Lake for twenty minutes, feeling stiff all over, his clothes soaked with water, dragging him down. Kreacher was not much better than him, even worse, so he had to pull Kreacher up with him to recover his strength. The

cold water flowed down Sirius's robe, and he walked up the steps step by step, shivering all over.

Kreacher's teeth were chattering with cold, and he couldn't speak clearly, but he still wanted to insist: "Kreacher has seen 47, no, 48..."

Sirius said with a dark face: "Do you want me to take care of you when you are sick? Come and have something to eat. He even made a fire. It's simply, simply..."

Sirius felt a little outrageous. There were all kinds of food scattered around the fire. He also saw two bottles of butter beer. This was not camping! He didn't know how he ate it, but he still replenished some energy.

"You can use the warming spell, which will make you feel better." Felix suggested without looking up.

...

One hundred, two hundred, Sirius looked at the faces of the Inferi one after another, and two hours passed.

But the Black Lake was too large, and because of Felix's magic, all the Inferi almost instinctively looked for dark corners and spread out, which made the search more difficult. Although all this was in vain - the bottom of the lake was not darker than the surface.

During this time, Felix kept observing the stone basin and the green potion in the stone basin.

For Voldemort, the Horcrux should be his most important thing, and the protective measures around the Horcrux should also be the strongest magic he can think of and master.

Felix can get a glimpse of Voldemort's strength.

In the black and white perspective, circles of magic ripples spread out with him as the center. Felix scanned this place and imprinted everything around him firmly in his memory. Then he finally moved. His hand reached into the stone basin. When he was one or two inches away from the potion, he could no longer dive.

Felix tried different methods, but none of them succeeded.

"Unless it is a brute force crack... But this is not an accurate measure of Voldemort's power, and he must have considered this issue..."

Felix called Kreacher who came up for the third time, "Do me a favor and bring me the ring I left outside. If it is very laborious, forget it."

"Yes, Mr. Happ."

Kreacher's figure disappeared, and after a few seconds, he appeared again with a ring in his hand.

"Is this ring a big burden for you?" Felix asked curiously. He was worried that Kreacher could not carry him, Sirius and a dozen Dementors together, but maybe this was a wrong idea.

"It's a bit strenuous... but not as strenuous as you alone, Mr. Hepp. You are really a powerful wizard, more powerful than anyone Kreacher has ever seen."

"Well, well, thank you, Kreacher."

Felix scratched his head. So, Sirius was so tired before, the problem was with him? But Sirius was crossing a long distance, while Kreacher was just a simple back and forth, there was no comparison between the two.

Kreacher bowed deeply, put his nose to the ground, and walked away backwards.

Felix took out a cup from the ring and threw it into the stone basin. This time, there was no magic blocking it, and the cup sank into the liquid. Felix reached out and took out the cup, observed it for a long time, and then poured the cup out.

The emerald green potion flowed out of the cup, forming a curved stream, but then it suddenly disappeared in mid-air. Felix emptied the cup, leaving no drop of liquid on the ground. He turned around, and the height of the liquid in the stone basin had recovered unconsciously.

"Interesting... Do I have to drink it?"

Felix fished out another cup of potion and tried to use the Scapin Current Spell to analyze the ingredients of the potion. Blurred images appeared above the potion, and it was impossible to see clearly. Felix had to search his memory for obscure magic. Some of them he had never used even once, but just classified and kept in his memory.

Fortunately, he learned things quickly. With the help of the Mind Cabin and his current understanding of magic, he could quickly master most magic.

"Mixed snake venom... venom of unknown creatures... mucus of Flobberworms... liquid from the horns of poisonous horns... and scurvy, which can make people impatient and reckless, and has a confusing effect... olfactory hallucination grass, a rare use..."

Felix raised his head and whispered to himself: "The effect of the potion does not seem to cause death, but intensifies pain and causes strong hallucinations? This is consistent with what happened to Kreacher. No, there is also the effect of chaotic magic, which makes it difficult for people to use magic... In this way, even powerful wizards will be dragged to the bottom of the lake in despair."

Half an hour later, when Sirius came up, he saw Felix pinching the neck of a Dementor and feeding it potion. Sirius' eyes almost popped out. Where did this thing come from?

Before he could ask, he heard Kreacher's cry: "Found it - Master Regulus -" The voice of the house elf kept echoing in the cave, over and over again.

Sirius turned over and jumped into the water, following the sound. He suddenly realized that he had not put on the Bubble Head Charm, but he didn't have time to think about it. He held his breath and swam quickly to Kreacher's side.

He saw a familiar person, who was not much different from his memory, but his face was a little paler, and his black curly hair was floating in the water.

Sirius murmured, and the pungent salt smell mixed with the rotten lake water choked him and made him tremble and cough violently.

He swam back to the shore with Regulus's body, gasping for breath and making a "ho ho" sound, but he was soaked all over, and the lake water flowed through his hair and eyes. No one would care if he shed tears.

When he calmed down, Sirius picked up Regulus and walked to Felix. The Dementors had disappeared. He took a look and saw that there was only a shallow layer of potion in the stone basin. A locket could be seen faintly at the bottom of the stone basin.

But he knew it was fake and had no interest in it. He just wanted to take Regulus back and settle him properly, and it would be best if he could hold a funeral.

"Sirius, Kreacher, wait for me outside. I need to do something else." Felix said.

"What are you going to do?"

"To put it bluntly, I want to do some damage..."

So Kreacher appeared outside the rock wall with the remains of Sirius and Regulus. After a long time, the rock wall in front of them began to peel off and turn into sand. They stepped back a few steps, watching the rock wall bloom with layers of light, and then quickly dimmed and decayed. The solid rock turned into fine powder, fell down, and finally formed an open hole.

Felix came out, and Sirius looked at the light behind him. The island in the middle of the lake had disappeared, and a small boat was swaying by the lake.

"Let's go." Felix said calmly.

"You destroyed this place?"

"It's not good to let the next person who comes in do useless work."

"Then your glowing magic, that big ball of light..."

"Don't worry about it, it will be gone in a week or two at most."

Felix dragged Sirius and Kreacher, along with Regulus's body, and disappeared into the cave in an instant.

"Boom!"

Large chunks of rock fell down, completely burying everything inside.