The Legend of Harry Potter Schoolmaster

"If you want to go on an underwater trip, gill grass is without a doubt the best choice for you.

It can help you swim freely in deep water; unlike the water bubble spell, once you dive too deep, it is easy to be squeezed by the water pressure.

Also not like some botched polymorph that makes swimming excruciatingly painful.

Of course, if your Animagus is a fish, you don't need to worry about this! "

This is a detailed description of the gills by Eladora Ketridge, author of the book "Mediterranean Miraculous Aquatic Plants and Their Properties".

Jon was there, and felt the joy that the gillsweed brought him.

In particular, he has a fire ash snake egg that can raise the water temperature, and a patron saint who can lead the way.

Of course, Jon didn't forget to cast a freezing spell on the fire snake's egg every few minutes; otherwise, if it burned all over, he might be scalded.

He had not forgotten that he had come to participate in the second project, not to play.

...

Jon was swimming in a dark lake, only the light of the Patronus could illuminate the passage; there was silence in his ears; small fish swam past him lightly.

The patron saint didn't make any sound, it just obediently stared forward with the blisters in it, while patrolling its surroundings.

"Aw!" Suddenly, the Patronus stared at Jon and let out a warning cry.

Jon understood, and quickly dived into the water with the bubbles containing the patron saint.

Not long after they dived, Jon seemed to see a big guy swimming slowly overhead.

An almost monstrous colossus, Jon reckoned he was about the size of a Ukrainian iron belly!

It's the giant squid in Lake Hogsmeade, they are the creatures at the top of the food chain in the lake... Under the water, they may be more terrifying than Ukrainian iron belly!

Jon tried not to make any sound, hiding among the weeds at the bottom of the lake.

Fortunately, the giant squid does not seem to be very good at diving, and its eyesight is also very average; after only a few minutes, it swam away.

Otherwise, Jon may have to explain this trip here.

...

Swim a little further.

In front of it was a piece of green water grass, two feet deep, which looked like a very dense lawn from a distance.

"Ow!" The patron saint gave another warning sound, looking at the pile of water plants vigilantly.

Jon nodded, he stretched out his wand, pointed forward for a while, and at the same time spit out bubbles:

"Diffindo!"

A few water plants were torn off in an instant, revealing a few hideous faces hidden inside.

A monster with horns, light green all over, looks like a water devil...

It's Grindylow!

The Grindylow is a magical creature that lives widely in lakes across Britain and Ireland. They feed on small fish, but also attack Muggles and wizards; Grindylow's long fingers are their main weapon.

At the same time, it is also their weakness. In the second-year Defense Against the Dark Arts class, Professor Remus-Lupine introduced in detail: "Although these fingers are quite powerful when grasping things, they are easy to break."

A few Grindyllos swooped in Jon's direction...

"Relashio!" Jon yelled, evenly, as a blister came out of his mouth...

This is the most reliable spell against Grindylow.

A jet of boiling water hit a Grindylow, turning its pale green paws red.

"Relashio!"

"Relashio!"

After repelling three Grindylos in a row, the Patronus no longer sounded vigilant.

Jon breathed a sigh of relief and passed the water grass smoothly.

The surroundings were almost plunged into complete darkness, and he could only feel the silence oppressing his eardrums... Jon knew that he had reached the real bottom of the lake.

Then it shouldn't be too far from the mermaid village.

...

The patron saint seemed to have a new discovery, and he quickly drifted in one direction.

Jon quickly followed behind the patron saint, knowing that it had found the location of the mermaid village.

They swam fast, and the time passed quickly...Jon looked at his watch, and fifteen minutes had passed since the race.

Suddenly, Jon heard a voice——

"We took away your most beloved baby.

You only have one hour..."

The mermaid's singing was clearly audible, which cheered Jon.

"After an hour there is no hope..."

Enduring the noise of the mermaid singing, after a few minutes, Jon found that under his feet, there were many houses made of rough sand and stones, covered with some algae.

In front of many small houses, there are several creatures with human bodies and fishtails standing.

The skin of these mermaids is an ugly iron gray, and the dark green hair is long and messy, like seaweed.

Their eyes were yellow, their broken teeth were also yellow, and around their necks they wore pebbles on thick strings.

In short, whether it is a male or a female mermaid, they all look quite ugly... Sure enough, fairy tales are all deceptive.

...

There are more and more houses made of sand and gravel, and it is obvious that this is the mermaid village.

Many ugly mermaids came out of it, looking at Jon curiously, pointing at his webbed hands, feet and gill sacs.

It's like a bunch of city folk watching a redneck.

Soon, Jon came to the central part of the mermaid village.

A very tall statue appeared in front of him.

It is a mermaid carved out of a huge stone, although it is relatively rough.

On the tail of the mermaid stone statue, four people were firmly bound.

All four of them seemed to be in a deep sleep, with their heads limply shrugged on their shoulders, and a string of thin blisters kept coming out of their mouths.

Four girls, all of them were tightly bound with ropes.

Astoria seemed to be lying on Hermione's lap, and Qiu Zhang was at her feet; and the eight or nine-year-old silver-haired girl on the other side must be Fleur's sister Gabriel.

Jon struggled to swim over there, but the merfolk around him did not stop him.

Looks like the ordeal is over here.

Beside the four girls stood a mermaid who was slightly taller than ordinary mermaids.

With a crown of seashells on his head and a choker of shark teeth around his neck, he seemed to be the leader of the pack.

"You can only take one of them away..." The mermaid leader gestured and made a hoarse voice: "...you came here the fastest!"

The little iron-eating beast inadvertently approached a few steps below, and the mermaids also did not stop it, and several female mermaids even showed maternal eyes to it.

"Sorry, I didn't have a choice before..." Jon shrugged, raising his wand at the same time.

"But now, I want them all!"

PS: Fourth update, gentlemen readers, please ask for a guaranteed monthly pass!