Mark stood deep in the cave, holding the ore emitting a faint blue light in his hand. This ore was larger and purer than the ones he had found before. The faint blue light flickered like breathing, as if it contained some powerful vitality. He took a deep breath and carefully brought the ore close to the blade of the ice sword.
"I hope it will work this time." Mark whispered to himself, with a hint of expectation and a hint of worry in his eyes. The previous experience of fusing other ores made him understand that this process was not smooth sailing, and the slightest carelessness could cause the energy of the ore to run away.
Carl stood aside, staring closely at the ore and ice sword in Mark's hand. He could feel the powerful energy contained in the ore, which made him feel a little uneasy. "Mark, be careful."
Mark nodded, and he slowly brought the ore close to the ice sword. At the moment when the ore touched the ice sword, a powerful energy suddenly burst out, and the faint blue light instantly filled the entire cave. Carl was caught off guard and was knocked back several steps by the energy. He hit the rock wall of the cave hard and groaned.
"Carl!" Mark saw this and immediately rushed forward to help Carl up. "Are you okay?" He was anxious and worried.
Carl covered his chest with his hands and coughed a few times. His face was a little pale. "It's okay, just a shock." He raised his head and looked at the ore in his hand. A trace of surprise flashed in his eyes. "The energy of this ore... is stronger than I thought."
Carl helped Mark sit aside, then picked up the ore that fell on the ground and observed it carefully. The surface of the ore was covered with strange runes, which flashed with a faint blue light, as if telling some ancient secrets.
"Carl, look at these runes." Mark pointed to the runes on the ore, "These runes... I seem to have seen them somewhere." He tried to recall, frowning.
"By the way, this is what I saw in the city in my dream." Mark paused, "The energy source in the center of the ancient human city is full of this kind of ore. Although I don't know if it is the ore of the same rune."
Carl took the ore and carefully observed the runes, with a flash of surprise in his eyes. "These runes... are not formed naturally." He said affirmatively, "They are artificially carved." He paused and continued, "This ore is not formed naturally, but artificially made." There was a hint of solemnity in his tone, "The captain should know this ore."
Mark's heart surged with uneasiness, "If the captain knew about this situation, why didn't he tell me before?"
Carl shook his head. "I don't know either." He held the ore in his hand and felt the energy contained in it, "But one thing is certain, this ore must be related to the energy source of your body."
Mark looked at the ore in Carl's hand, his eyes full of doubts. "What should we do now?"
Carl pondered for a moment, his eyes wandered around in the cave, and finally fixed on the depths of the cave. "Let's go deep into the cave and take a look."
Mark nodded. He knew that Carl was right. He stood up with Carl's help. The two of them continued to go deeper into the cave. The passage was rugged and the ground was covered with thick snow. Every step was extremely difficult.
Deep in the cave, the air became colder, and some strange patterns began to appear on the cave wall. These patterns were very similar to the runes on the ore, flashing a faint blue light.
"Carl, look!" Mark pointed to the patterns on the cave wall. "These patterns... are the same as the runes on the ore." There was a hint of excitement and a hint of nervousness in his voice.
Carl walked to the cave wall and observed the patterns carefully. There was a flash of surprise in his eyes. The arrangement of these patterns was very special. They seemed to be guiding something. "These patterns... are like a map." He said affirmatively, "They are guiding us to somewhere."
A surge of hope surged in Mark's heart. "Then what are we waiting for? Let's go!"
Carl nodded, and they continued to go deeper along the guidance of the patterns. After walking for a long time, they came to a huge stone door. The stone door was engraved with runes, which were exactly the same as the runes on the ore, flashing a faint blue light.
"It's here." Carl's voice was full of excitement.
Mark looked at the mysterious stone door, his heart full of expectations. He walked to the stone door, stretched out his hand, and gently touched the runes. The runes were cold to the touch, emitting a faint energy fluctuation. He felt a mysterious force attracting him, as if calling him to enter the world behind the stone door.
"Carl, how do we open this door?" Mark turned around and asked Carl, his tone mixed with uncontrollable excitement and a little bit of imperceptible nervousness.
Carl walked to the stone door and observed the runes carefully. He stretched out his fingers and moved slowly along the rune lines, trying to interpret the meaning of these runes. "These runes... seem to be an ancient text." He pondered for a moment, "I need some time to interpret them."
Mark nodded, he walked aside, and observed the surrounding environment vigilantly. He knew that in this mysterious frozen hell, anything could happen. He clenched the ice sword in his hand, and a cool touch came from his palm, which made him feel a little relieved.
Carl sat cross-legged in front of the stone door, his eyes fixed on the runes, and his fingers tapped gently on the runes, as if playing an ancient piece of music. Time passed by minute by minute, and the cave was quiet, with only the sound of Carl's fingers tapping the stone door and Mark's occasional breathing.
"Got it!" Carl suddenly said, with a hint of excitement in his tone, "I found a way to open the stone door."
Mark immediately walked to Carl's side, his eyes flashing with anticipation. "Carl, what is the method?"
Carl stood up, and his fingers tapped on the stone door quickly a few times. The runes on the stone door suddenly emitted a dazzling light, and then slowly rotated inward, revealing a deep passage.
"Let's go." Carl said, and took the lead in walking into the passage.