"Sacrifice?" Mu Yu looked at Qiao Xue puzzled, "Do you use demon spirits like you activated the formation just now?"

When they were in the cave at the beginning, they relied on demon spirits to activate the formation, and then they entered the abyss below.

"No, it takes blood to open this door. Qiao Xue stared at the relief above the door illuminated by Mu Yu, her expression disgusted. The statue's mouth was wide open, revealing its long fangs, as if to warn outsiders not to act rashly.

"Blood? Mu Yu muttered in disgust.

This door embedded in the stone wall is also a barrier for the demon clan to defend against foreign invaders, and if you want to open this door, you need to pay a little price, and at the cost of blood can weaken the strength of the invaders, which can also be regarded as a means.

"How much blood?" asked Mu Yu.

Qiao Xue shook her head and said, "Maybe just a drop, maybe a whole person's blood, who knows! The demon clan people have never easily let the human race enter their territory, so if it is changed to human blood, it may be more, and if it is changed to demon blood, it should be less." ”

If he only needed a small amount of blood, Mu Yu could accept it, but he didn't want to try it easily until he was unsure. And Mu Yu soon noticed a more serious problem, he looked around at the blood bats that were staring at him, and suddenly understood why these blood bats were so quiet all the way they came.

Blood bats are called blood bats because they are bloodthirsty. They didn't emit the smell of blood when they came down, so they didn't anger these blood bats, and when any of them used blood to open this stone door, the blood bats entrenched on the rock wall would inevitably riot when they smelled blood. At that time, the overwhelming blood bats rushed over, and even if the two of them had the cultivation of the Yuan Infant Stage, it would be difficult to resist the attacks of so many blood bats.

"It's all blood bats, you can't use blood. Mu Yu said in a deep voice.

Qiao Xue also knew this, but they fell into a dilemma. Sacrifice this stone door with blood, not to mention the amount of blood, if these blood bats are allowed to riot, just dealing with these thousands of blood bats will be enough to give them a headache.

"Let's see if there are any other exits. Mu Yu suggested. If there is another exit, you don't have to think about this damn statue, it looks so ugly and drinks blood, why doesn't it go to the sky?

Mu Yu and Qiao Xue stepped on the enchantment and surveyed the rest of this abyss, and there was no other exit except this stone gate, which made them a little frustrated. Originally, Mu Yu also wanted to check the place where the blood bats were entrenched to see if the exit was blocked by them, but this approach was too risky, in case it angered the blood bats, the end would be the same as the result of opening the door with blood.

Another way is to break the barrier under your feet and continue to fall down into the abyss. After Mu Yu gave up after a slight consideration, this enchantment was so solid that even the cultivators in the out-of-body stage might not necessarily break it with force, let alone the two of them.

"This demon array is too big, and it's a bit difficult to find the eye of the formation. Mu Yu sat on the barrier and said helplessly. The best way to break the formation is to find the formation eye or formation base, but they have landed all the way down for hundreds of miles, and it is too unrealistic to find the formation base or formation eye on the stone wall of hundreds of miles.

"There must be other exits here. Qiao Xue didn't seem to want to give up, she turned around and ran around to continue probing.

Mu Yu couldn't stay here for too long, he still had to find the Nine Qi Soul Cleansing Flower and the Underworld Grass, which was the purpose of his coming to the Second Heaven. There are only two ways to get out of here, one is to crush the jade pendant, and the teleportation array should teleport him out, and the other is to open this stone door with blood.

"Xiao Shuai, what are you looking at?" Mu Yu found that Xiao Shuai had been silent since he saw the statue on the stone door, staring at it for a long time, his eyes were a little confused.

Xiao Shuai scratched the back of his head, shook his head and said, "I always feel familiar with this ugly stone carving, have you seen it anywhere?"

Mu Yu smiled: "This can't be your relative, right? If so, then quickly recognize the kiss and say something good, maybe we can go over without sacrificing." ”

Xiao Shuai pouted, flew around the air twice, and then said: "I look so handsome, it's so ugly, how can it be my relative?"

Mu Yu rolled his eyes, this guy looked narcissistic everywhere. He glanced at the stone sculpture, but saw Qiao Xue in front of the stone sculpture, and she was holding a dagger and slashing her wrist-

"Hey, wait! What are you doing?"

Mu Yu didn't expect Qiao Xue to want to fight, and directly used blood to sacrifice to open the stone door, he wanted to stop it too late, the faint smell of blood had already spread, and Qiao Xue dripped blood onto the forehead of the stone carving.

Blood flowed down the forehead of the stone sculpture to the mouth of the stone carving, and the stone sculpture suddenly opened its eyes suddenly, and a strange yellow light lit up in the stone carving's eye sockets. In Mu Yu's stunned gaze, the stone statue seemed to come to life, it shook its head, and the dust and moss on the fangs in its mouth were shaken off, revealing an eerie cold glow. At the same time, a huge suction force came from her mouth, and the blood on Qiao Xue's wrist was sucked into the stone sculpture like a column of water bursting the embankment.

"What are you doing so recklessly?" Mu Yu hurriedly rushed over, wanting to help Qiao Xue stop the bleeding, but Qiao Xue pushed Mu Yu away, shook her head and said, "This is the only way." ”

"Is there only one way to die?"

Mu Yu was a little angry, Qiao Xue was too reckless, and she didn't even want to discuss it with Mu Yu before she acted on her own. He looked up at the blood bats on the rock wall, the blood bats on the rock wall that were only flickering suddenly all lit up with blood-red eyes, and there was a sound of rustling in the sky, and many blood bats had already smelled the smell of blood and began to move.

"Pounce!"

A blood bat quickly rushed over and aimed at the wound on Qiao Xue's wrist. This blood bat was only a third-order demon beast, and it was not enough to worry about it at all, Qiao Xue subconsciously waved his hand to split this blood bat in half. Soon she knew what she had done wrong, and after the blood bat was killed, a pungent smell spread from its body, and the nearby blood bats seemed to be stimulated by the smell, and they all screamed, flapping their wings and surging over the sky.

"Cover your ears!" Mu Yu's face changed, and he suddenly shouted loudly.

The screams of blood bats are extremely lethal, and can disturb people's minds and even fall into a severe coma. The sound waves of one or two blood bats won't hurt them yet, but there are thousands of blood bats here, and the impact is quite terrifying. With the call of the first blood bat, all the blood bats responded one after another, and the sharp and piercing sound waves reverberated in the abyss.

Qiao Xue and Mu Yu immediately used their spiritual power to seal their hearings, and the surroundings fell silent all of a sudden. However, the disadvantage of sealing their hearing is obvious, they cannot use the sounds around them to avoid the attacks of blood bats. Thousands of blood bats tore and bit all towards Qiao Xue, the smell of blood on her hands was captured by the blood bats, arousing the murderous nature of the blood bats, once they were touched, they would be sucked dry of the blood of the whole body!

Qiao Xue found that the stone door still showed no sign of opening, and the blood she contributed was not enough to meet the amount of sacrifice, but the tide of blood bats had already swarmed in, and she could only raise the blue ribbon in her hand to wrap herself in it. The Blood Bat collided with the Blue Ribbon and bounced off, but the Blood Bats rushed forward desperately to break through the Blue Ribbon's obstacles.

"It's a demon soul and a blood bat, damn, are the demon people so idle?"

Mu Yu had a shadow sword qi in his hand, and many blood bats were killed by him in the staggered sword light, after the blood bats were split by the shadow sword, the dark purple blood spilled out, and the other blood bats split and devoured the dead companions in the blink of an eye, they didn't even let go of their own kind! But there were too many blood bats in this abyss, and Mu Yu resisted for a while and knew that sooner or later, these blood bats would drain their spiritual power and become the prey of the blood bats, and he had to find a way to solve these blood bats at once.

"Xiao Shuai, what are the blood bats most afraid of?" Mu Yu Shadow Sword evolved into the Dust Nine Style, and the flickering body made it impossible for the blood bats to get close, and at the same time, he also helped Qiao Xue resolve the siege of the blood bats, after all, most of the blood bats' targets were on Qiao Xue.

"Flame, are we going to make a fire?" Xiao Shuai replied on Mu Yu's shoulder, and from time to time it swept its tail around, stirring the surrounding spiritual power and swinging the blood bats out.

"If only that guy Luo Yan was here. ”

Mu Yu thought that these blood bats were just a wave of his hand for Luo Yan, but it was a pity that these blood bats were not afraid of their own trees. He took out the Dan flint, fortunately this thing is a mass product, he got a lot of it before he came, and it came in handy at this moment. Bright flames soon rose into the sky, illuminating the surroundings. The blood bats screamed angrily to avoid the flames emitted by the Dan flint, and they avoided Mu Yu and turned to Qiao Xue. Mu Yu hurriedly jumped to Qiao Xue's side, frantically injecting spiritual power into the Dan flint, and the flames used Mu Yu's spiritual power as the source, emitting a blazing light.

Mu Yu doesn't like flames, which are in some ways the nemesis of plants, but at the moment they have become his lifesaver. It's a pity that he can't control these flames, otherwise he can take the initiative to attack and control the flames to destroy the blood bats like Luo Yan did. The blood bats dodged the flames, did not dare to approach, and wandered in the distance, waiting for an opportunity to move.

The blue ribbon on Qiao Xue's body had been scattered, her face was pale, and the blood on her wrist was still being sucked away by the stone carving. Seeing that the situation was not right, Mu Yu immediately pulled Qiao Xue's hand back from the front of the stone carving, and then helped her stop the bleeding. The blood bats stopped calling, and they regained their sense of hearing.

"You're so reckless in doing this!The stone carving will probably suck you dry!" Mu Yu said with a frown. He was thinking quickly about countermeasures, these Dan flint stones could only drag on for a little time, the Dan flint burned the spiritual power of cultivators, and once the spiritual power was exhausted, it was a good opportunity for these blood bats to fight back again.

"What can we do then? We're just waiting here?"

Qiao Xue was not convinced, but she also knew that she was at a loss. The blood needed for the stone sculpture exceeded her expectations, and even squeezing the blood out of her body would not be enough to open the stone door.

"If it sucks most of the blood out of this, will you be able to cope with the next danger? Mu Yu's eyes casually glanced at the stone carving, and when he saw the blood stains around the stone carving, his eyes suddenly lit up.

"I have a way!" a bold idea quickly swirled in Mu Yu's mind.