"Where is the legendary ship?" Xiao Tangqiu continued to ask.

The pirate hesitated for a moment, then confessed honestly. He pointed to the sunken ship at the bottom of the lake and said tremblingly, "It's right down there..."

Tang Mianmian snorted and asked, "There are so many sunken ships down there, how do you know which one it is?"

The pirate said shakily, "The biggest one is it."

Xiao Tangqiu soon discovered which ship the pirate was talking about. In the Thousand Ship Graves at the bottom of the lake, there indeed appeared an extremely huge shipwreck. The ship was larger than any pirate ship, even larger than the luxury cruise ship they had seen before. The hull was white, which was very unusual.

After a closer look, he found that the ship seemed to be made up of human bones and skeletons. The hull was made of human bones and skin, and the observation tower was made of piled skulls. Although they sank to the deep sea, they seemed to be watching the people on the shore quietly.

He just looked at the ship from a distance and felt a chill down his spine.

Shen Yuan made a prompt decision and said, "Let's go down and take a look."

"But what should we do with these pirates? Tie them all up?" As soon as Tang Mianmian finished speaking, the ground shook violently and there was an unusual noise around.

"What's going on?" Everyone was wondering, and the group of pirates who were knocked to the ground by them screamed in horror.

"It's the guardian of the treasure!"

"The guardian of the legendary treasure is a sea monster at the bottom of the sea!"

The guardian of the treasure? A sea monster?

Something flashed through Xiao Tangqiu's mind, and the next moment, he felt his vision go dark. The top of the cenote, where light had once shone, was now shrouded in darkness, as if someone had suddenly drawn a curtain over his eyes.

"Ahhhh! Here it comes! It's the treasure's guardian sea monster!"

The pirates screamed in terror. In the panic, some of them slipped and fell into the lake at the bottom of the sinkhole, while others turned around and ran back.

Xiao Tangqiu took a closer look and discovered that there was a huge monster lying on the top of the sinkhole. The size and shape of this monster were so astonishing that it completely blocked the top of the sinkhole, preventing any light from entering. This was why the entire sinkhole was plunged into darkness.

He had already guessed what the sea monster guarding the treasure was. Shen Yuan's eyes darkened as he said coldly, "Optus!"

Tang Mianmian's face turned pale. "What the hell! That giant octopus? It didn't die in the whirlpool? It actually followed us here?"

Xue Junli, who was standing by, explained, "Optus is a first-generation demon, a direct creation of the Abyss Demon. It won't die so easily... But why is it here?"

Tang Mianmian speculated, "If it is the guardian beast of the treasure, could it be guarding some treasure related to the Abyss Demon?"

Xiao Tangqiu couldn't help but ask: "That's not right! Aren't demons not allowed to come to the dungeon world casually? Especially this kind of high-level demon... and it has obviously been in this dungeon for many years..." If the pirate just now didn't lie to them, this legendary treasure has existed for hundreds of years, then Optus should have been in this dungeon for hundreds of years.

Shen Yuan said coldly, "This means that someone summoned it here through sacrifice many years ago."

Xiao Tangqiu subconsciously asked, "Who?"

"The devil's followers," Shen Yuan was obviously unwilling to explain further, but in response to Xiao Tangqiu's questioning, he still explained lightly, "Those who possess the devil's book... such as Lepnobert."