Seeing that the ship finally rose, Ivan breathed a sigh of relief and loosened the chain, but then sensed the magic in his body, and his face darkened again.

"How's it going? Are you alright, Ivan? Sirius said worriedly.

"I'm fine, it's just half of my mana!" Ivan shook his head and explained.

Dumbledore was right in the original plane, Voldemort counted on the intruder to make corresponding sacrifices at every step, weakening layer by layer like a frog boiled in warm water, until finally he was powerless to resist and drowned in the lake.

First, open the door to draw blood, consuming a lot of physical strength and a small amount of mana.

Immediately after raising the boat, it takes half of the mana to expend again, and the last row to the central island has to face the problem of whether to drink or not to drink medicine.

Ivan could only sigh that Voldemort's bad taste was really extraordinary, and it was better to give the intruder a pleasure directly...

A group of three and two elves came in, sharing the burden with each other, and they were all in a bad state, and it was hard to imagine how Regulus could have managed to make it all the way.

"Is this the ship? It doesn't look sturdy, so it shouldn't sink halfway, right? Lupin took a few steps forward and tapped lightly with his wand.

"Probably not! Voldemort must be counting on himself to come back in the future, and I'm sure he doesn't want to fall into the lake halfway! Ivan said.

Both Lupin and Sirius nodded, relieved.

Ivan continued. "I've guessed a bit about how this ship works, it absorbs half of my mana for operation, and according to what we just judged, it could probably make two of me sit on it!"

"Two of you? That's not good news, how much do you weigh? Sirius frowned.

"I mean magic!" Ivan rolled his eyes angrily, "Voldemort doesn't think about weight!" Only consider how much magic has crossed the Black Lake! And my magic is no less than that of an adult wizard, so this boat can accommodate two adult wizards to cross the lake together."

Ivan thinks that while the copper chain just now absorbs his magic power and supplies the ship to operate, it is also a measure of how much magic power he has!

According to the rules, one person brought one victim, so there must have been two summons in exchange so that Regulus could board the ship with his equivalent Kreacher with his magic.

And this amount of mana absorption is probably limited, if you change to Dumbledore, you will definitely not be drained of half of the mana.

However, correspondingly, the small boat could not fit two of him, so the old professor misjudged that the boat was specially for one person.

In the end, Dumbledore was able to take Harry on the boat because Harry's magic was nothing compared to the magic he had sacrificed.

"That means only two people can get on the boat, and the others must stay here?" Sirius's expression was not very good-looking.

"That's how it should be... Anyway, I'll go with you! Professor Lupin had bled a lot just now, and it would be difficult to do it if he was physically exhausted when he went down to the lake, so it would be better to stay on the shore to support us. Ivan explained.

Even if he loses a lot of mana, it will not affect his combat effectiveness, and he can only say that his endurance is worse.

But Lupin is different, I am afraid that there are thousands of milliliters of blood consumed to open the door, not to mention salvaging the body, it is not bad if it is not fished out.

"Isn't there any other way to cross the lake?" Lupin is also very aware of his physical condition, but he is not worried that Ivan will do this dangerous thing.

He looked at the black lake in front of him with some unwillingness, thinking if he could transform into another boat.

"I'm afraid a normal ship can't sail on it, but we can try this!" Ivan thought for a moment and waved his wand at a black rock on the shore.

The hard rock suddenly softened, changing shape as if it had been kneaded by a large invisible hand.

A moment later, a sturdy eagle appeared in front of them, let out a low chirp, and then flapped its wings vigorously and flew towards the center of the black lake.

Sirius, who had seen Ivan Animagus in form, immediately guessed what he meant, if he could fly over the lake, then Ivan could completely turn into the form of an owl and follow the boat, leaving an empty seat to take one more person!

Majestic eagles flew across the lake, and there seemed to be no danger in the sky.

However, before everyone could be happy, they saw that the eagle suddenly fell into the water, fluttered a few times, and was grabbed by a few hands stretched out from the water, and dragged to the black lake.

Looking at this scene, the corners of Ivan's mouth couldn't help twitching.

He was sure that the forbidden sky magic was applied there, but it was insidiously applied to the second half of the lake, and if anyone thought they could slip through with a broomstick without taking a boat, they would fall into the lake halfway.

"Well, it looks like Voldemort didn't leave any holes for us to drill—" Sirius sighed helplessly, and stepped aboard the boat.

The ship immediately sank nearly halfway, and when Ivan got on board, it sank again, but it seemed that there was still a little room to spare.

Ivan was keenly aware of this, and after thinking about it, he realized that it was because he had consumed half of his mana just now, so he had vacated some places.

Thinking of this, he looked at the old house-elf on the shore and spoke. "Kreacher, how much magic do you have now, if it's less than half, you can come up and try it!"

"That's too risky, isn't it?" Lupin tried to stop it, but Kreacher had already climbed up, and the ship bobbed a few times, but it didn't sink.

"Exactly, just like I thought!" Ivan wasn't surprised at all, Kreacher had used the illusion shift many times before, and it was still the kind with the two of them, and it would be nice to have a third of the magic power left.

Lupin shook his head, disapproving of Ivan's risky actions, but reminded them before they set off.

"Ivan, as your former Defence Against the Dark Arts professor, I have to test you, what should we do if we encounter a Yin corpse?"

"Use the Fire Charm!" Ivan thought for a moment and replied.

"Yes, you've always been smart, Hals! The Yin Corps is afraid of light and heat! Lupin laughed.

"But I don't think that helps, you can't expect me to summon flames under the water," Ivan spitted.

Lupin's expression became a little embarrassed.

The boat carrying the two men and one spirit had already moved slowly, heading towards the middle of the lake, and Ivan only then found that he had forgotten something for Lupin, so he immediately shouted at him, and then threw the reagent bottle over.

Lupin hurriedly stretched out his hand to take it, looked down and saw that it was a bottle of brown potion, and was puzzled when he heard Ivan's voice coming from a distance.

"If you're in danger, drink this potion and transform into a werewolf!"