After the two walked a distance from the city wall into the interior, the shadows of some buildings gradually appeared on both sides of the road. This street seemed to be a commercial street, and the buildings on both sides looked somewhat similar to the small street that Gu Shi had visited at the Pearl Assembly.

Gu Shi looked at the buildings as he walked, wondering whether he should randomly pick one to go in and take a look.

"careful!"

Thanos pulled away Gu Shi, who was still thinking, and the next second, a long black shadow, like lightning, plunged into the ground where Gu Shi had just stood.

Gu Shi came to his senses in an instant. After realizing that he had suffered an unknown attack, he immediately cast an elemental shield. While the solid wind wall enveloped him, Gu Shi also vigilantly looked at the dark areas around him that were not illuminated by the light.

Gu Shi thought to himself: Strange, he clearly didn't feel any breath of life, what was attacking him just now? Could it be that he accidentally stepped on a trap?

"On the left."

Thanos on the side has already determined the source of the attack. As a mermaid, he is naturally extremely sensitive to fluctuations in water flow and can detect subtle changes that humans cannot perceive.

Thanos took out his weapons, a pair of gorgeous and sharp scimitars, the precious gems inlaid on the handles sparkling in the light.

And so, with Thanos leading the way, the two of them walked towards the direction of the attack.

He had just taken two steps forward when another black shadow rushed towards him from a different direction. Thanos reacted quickly and swung the sharp blade in his right hand violently.

The blade collided with the black shadow, making a crisp sound, and the black shadow was bounced far away and disappeared into the darkness.

Thanos, who was attacked again, no longer hesitated. He swung his tail and shot forward like a sharp arrow.

The attacker in the dark seemed to realize that his position had been exposed, so he stopped shooting arrows one after another as before, and instead launched an all-round attack.

Looking at the large black spot in front of him, Gu Shi waved the staff in his hand, and an ice wall about two meters high rose in front of him, and then quickly moved forward.

Although this was the first time they encountered an attack since entering this sea area, Gu Shi’s days living on the seabed were not in vain. He had long since figured out what effect his spells would have in the water and how to use it.

By the time the ice wall came into contact with those attacks, its area and thickness had increased a lot, and those black attacks were unable to penetrate the wall at all.

Gu Shi fired another wind blade right after the ice wall. He controlled the force well and did not let the wind blade shatter the ice wall. Instead, he let it add strength to the ice wall, causing the ice wall to smash straight towards the source of the attack.

Even though Gu Shi couldn't determine the attacker's location as accurately as Thanos, the huge size of the ice wall made up for it.

With a thud, Gu Shi's ice wall pressed the attacker hard to the ground.

It’s a pity that the ice wall failed to cause much damage to the attacker. With a crackling sound, the attacker broke a big hole in Gu Shi’s ice wall and drilled out.

But he still failed to escape. Thanos followed closely behind the ice wall, ready to press the attacker who had broken through the ice firmly onto the ice surface.

The moment Thanos reached out to touch the attacker, a look of surprise appeared on his face. He failed to catch the black shadow.

Seeing that the black shadow wanted to escape, Thanos immediately used a fighting skill to stop him.

Seeing the black shadow fall heavily under the influence of the fighting skills, Thanos thought in his mind. He quickly grasped the key and successfully subdued the attacker.

The attack was thus settled.

Hearing that the noise in front had gradually disappeared, Gu Shi quickly walked towards Thanos. As the distance gradually shortened, he saw clearly that Thanos's men were suppressing a struggling black shadow.

Gu Shi couldn't help but ask, "What is this?"

"I don't know either." Thanos looked at the black shadow that was still flopping on the ground and had been tied up with a rope by him with a complicated expression.

It was a dark figure with a human body and a fish tail. He was surrounded by vague shadows. Even under the bright light of Pearl, Gu Shi and the others could not see the face of the dark figure clearly.

"It looks like he can't speak. There's no breath of life on him, but he doesn't look like a ghost..." Gu Shi said as he stretched out his hand to test the shadow.

"Huh? What's going on?! He has no physical body?"

Gu Shi looked at his right hand in surprise as it had penetrated the black shadow directly. He then tried again several times, but still did not feel any substantial touch on his hand.

Gu Shi reached out again to touch the part where the shadow touched the rope, but he still found nothing in his hand.

Gu Shi turned to look at Thanos and asked in amazement, "How did you do it? You actually managed to use this tangible rope to bind this invisible black shadow."

Thanos explained: "It's nothing, actually. This rope is just an ordinary alchemical tool. If you want to touch this shadow, you can try to attach a layer of magic power to your hand."

Gu Shi turned around and attached a thin layer of magic power to his hand according to what Thanos said, then stretched out his hand again.

This time he finally felt a tangible touch on his hands. With a research mentality, Gu Shi touched the mermaid-like black shadow up and down, left and right, and finally stood up with a feeling of being unsatisfied.

Gu Shi couldn't help but sigh, "It clearly looks human-like, but it feels like slime when touched. It's soft and bouncy. What on earth is this thing?"

Thanos shook his head. "I don't know either. Gu Shi, what do you think we should do with him?"

Gu Shi glanced at Thanos and said hesitantly, “Why not just get rid of him?

After all, we can't take him with us on the road, but if we just leave him here, what if he breaks free and comes to cause trouble for us again?"

Although this black shadow does not look like a living being, its appearance is similar to that of Thanos's fellow creatures. This is also Gu Shi's first time to come into contact with mermaids, and he doesn't know what their attitude is towards their fellow creatures.

Thanos sighed, "It's a pity that he can't speak, otherwise we could get more clues about this place from him."

It turned out that Thanos was thinking about this just now. Gu Shi looked at his complicated eyes and thought he was thinking about something else.

Thanos had no idea what was going on in Gu Shi's mind. After deciding how to deal with the black shadow, he raised his scimitar and lightly slashed it in front of him. A sharp water blade appeared at the edge of the scimitar and pierced through the chest of the black shadow on the ground.