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"Yes, this time we must ensure the safety of the base." Su Chen nodded, agreeing with Doctor Strange's opinion.

Tony also joined the research. He used the armor's scanning system to conduct a detailed analysis of the runes on the stone wall: "The energy structure of these runes is very complex, but if we can use them correctly, we can indeed greatly enhance the defense of the base."

Thor clenched his hammer tightly and said with fighting spirit: "No matter how powerful the enemy is, we will make them pay the price."

Black Widow also expressed her support, and everyone began to work together and quickly began to build a new defense system. Su Chen and Doctor Strange set up a huge energy formation around the base, and Tony used technological means to combine the power of runes with the defense system to create a new protective barrier.

"This barrier requires a powerful energy source. We must ensure a stable supply of energy." Tony said and began to adjust the energy core.

Su Chen concentrated his energy, formed seals with his hands, and began to chant the spell: "The spiritual energy of heaven and earth, use the law to act, the Qiankun formation, protect the base!"

Powerful energy gathered in the formation, and light flickered around them, as if foreshadowing the birth of an unprecedented power. With the joint efforts of Su Chen and Doctor Strange, the protective barrier gradually took shape, and the entire base was covered by a powerful energy shield.

"This time we have a stronger protective barrier, and the enemy can no longer easily break through our defense line." Su Chen said, with a determined light flashing in his eyes.

Tony nodded: "Yes, but we still need to recover our strength and re-formulate our attack plan."

Thor clenched his hammer tightly and said with fighting spirit: "No matter how powerful the enemy is, we will make them pay the price."

Black Widow and Doctor Strange also expressed their support, and everyone began to divide the work and cooperate to quickly restore their strength and morale.

During the rest period, Su Chen and his teammates conducted many tactical drills and training. They constantly summed up the lessons learned from previous battles and worked hard to improve everyone's combat capabilities. Su Chen also worked with Doctor Strange to study new spells, trying to find a more powerful force to fight the enemy.

One night, Su Chen sat alone on the top of a mountain outside the base, looking up at the starry sky, his mind full of thoughts. Suddenly, he felt a familiar energy fluctuation, which was the power of the guardian.

"Guardian, you are here again." Su Chen whispered, closed his eyes, and tried to communicate with that power.

The voice of the guardian rang in his ears: "Su Chen, I am pleased with your efforts, but the real challenge is still ahead. The enemy's strength is far beyond your imagination. You must find a stronger force to fight against it."

"We have tried our best, but the enemy is too powerful." Su Chen sighed.

"Deep within this planet lies an ancient energy source. It is your last hope against the enemy." The Guardian's voice was filled with wisdom and power.

"Ancient energy source?" Su Chen asked in surprise.

"Yes, it is a mysterious energy that can fight against the forces of darkness. You must find it and use its power to enhance your defense and attack." The guardian explained.

Su Chen nodded: "Thank you for your guidance, we will find it as soon as possible."

The voice of the guardian gradually faded away, and Su Chen felt an unprecedented determination. He knew that this time they had to find that ancient energy source in order to completely defeat the enemy and protect the peace of the universe.

The next day, Su Chen told his teammates about the guardian's guidance. After hearing this, everyone expressed their support and decided to take action immediately to find that ancient energy source.

"We must find that energy source as soon as possible. This battle will determine the fate of the universe." Su Chen said firmly, with determination flashing in his eyes.

Tony nodded: "Yes, we can't fail again."

Thor clenched his hammer tightly and said with fighting spirit: "No matter how powerful the enemy is, we will make them pay the price."

Black Widow and Doctor Strange also expressed their support, and everyone quickly began to prepare, embarking on a journey to find the source of energy with new hope and determination.

They traveled through countless stars and finally arrived at an ancient planet. This planet was full of strange sights and mysterious creatures, and Su Chen could feel the powerful energy fluctuations.

"The energy here is very strong. The energy source must be nearby." Su Chen said, leading his teammates to explore the planet.

During the exploration, they discovered a huge ancient temple. The temple was engraved with complex runes, and the air was filled with a mysterious atmosphere. Su Chen and Doctor Strange carefully studied the runes and found that they recorded a powerful energy source, which was the target they needed to find.

"This is the energy source we are looking for." Doctor Strange said excitedly, with a gleam of hope in his eyes.

Su Chen nodded: "We must find a way to activate these runes in order to obtain the power of the energy source."

They conducted detailed research in the temple and finally found a way to activate the rune. Su Chen and Doctor Strange formed seals with their hands and began to chant spells. Powerful energy gathered in the temple, and light flickered around them, as if foreshadowing the birth of an unprecedented power.

"Spiritual energy of heaven and earth, borrow the law to act, energy source, awaken!" Su Chen and Doctor Strange exerted force at the same time, the light of runes shot straight into the sky, and powerful energy fluctuations swept the entire temple.

With the support of this powerful energy, Su Chen and his teammates' strength has been significantly improved. They know that the future battles are still full of challenges, but this time they have more powerful power and must seize the opportunity to completely defeat the enemy.

"We won't fail again this time." Su Chen said firmly, with determination flashing in his eyes.

Tony and Thor also expressed their support. Everyone's morale was high and they were determined to meet every challenge in the future and protect peace and justice in the universe.

They returned to their base with new strength and hope. The Avengers assembled again, ready for the ultimate battle that would determine their fate. They knew that this battle would determine the fate of the universe, but no matter how powerful the enemy was, they would not back down.

"Fight for peace!" Su Chen shouted, leading the Avengers towards the enemy's last stronghold.

The battle started again in the depths of the stars, and fierce energy fluctuations filled the entire universe. Su Chen and his teammates went all out, using their wisdom and courage to fight the enemy in an unprecedented fierce battle.

In this fateful battle, Su Chen and the Avengers will use their strength and faith to write an immortal legend. They know that as long as they unite,