Nie Yan obtained a seventh-tier crystal core for the first time. The highest he had obtained before was only a fourth-tier crystal core, and this crystal core was non-attribute, meaning that any creature could consume it.

After taking out the Dragon Crystal, the Gold Dragon was completely finished.

After Nie Yan obtained this seventh-tier crystal core, the Darkwing Dragon released its claws, and the Gold Dragon's corpse quickly fell.

Nie Yan stretched out his left hand, shooting out a strand of spider silk that stuck to the Darkwing Dragon, and somersaulted onto the Darkwing Dragon's back.

The Darkwing Dragon carried him away at top speed.

The bloody aura in the sky quickly spread out. Several large flying creatures rapidly swooped over, one of which was the ninth-tier Golden Eagle from earlier. Watching those large flying creatures pouncing over, Nie Yan felt anxious. If this continued, the Darkwing Dragon would definitely be killed by those flying creatures. He chanted a spell, and after a moment, the Darkwing Dragon suddenly disappeared, having been recalled to his pet space.

Nie Yan leaped and jumped onto the rock wall of the Fortress of the World's Heart. Those large flying creatures missed their target. They circled around for a moment, and not finding Nie Yan hidden in the vines, they swooped down towards the place where the Gold Dragon had fallen.

Seeing those large flying creatures fly away, Nie Yan dared to come out of the vines, breathed a sigh of relief, and climbed towards the entrance of the World's Heart.

Nie Yan was like a gecko, his limbs clinging to the rock wall as he moved quickly. After more than two minutes, the entrance to the Fortress of the World's Heart was close at hand.

Nie Yan jumped up, steadied himself at the entrance, and looked inside. The interior of the Fortress of the World's Heart was a huge space. The top was about fifty or sixty yards from where he was standing. Being in this vast space, Nie Yan felt his own insignificance, as if he had come to an ancient temple. He walked into the World's Heart. There was no light around, it was quiet, and the sound of his footsteps extended into the endless distance.

Because of his Dark Vision, Nie Yan could see an area of about fifty yards, which was all flat ground, empty of everything. After walking forward in the dark space for about thirty minutes, a huge spherical crystal appeared in Nie Yan's field of vision in the distance.

This huge spherical crystal was as big as a small hill, suspended in the air more than five yards high, emitting a scorching white light, burning like the sun, and radiating turbulent energy outwards. This was the legendary World's Heart, said to be the source of all magical elements and divine power!

The closer he got to it, the warmer Nie Yan felt all over, enveloped in a white light. His thoughts seemed to travel to another space, and a voice was calling him. Nie Yan involuntarily walked towards the World's Heart.

At this moment, a clear system prompt sounded.

System: You have come to the Space of the Gods and discovered the ancient World's Heart. It floats here silently, for tens of thousands of years, longer than any life. Comprehend its power and feel the call of the gods.

Nie Yan's thoughts seemed to be drawn away, leaping across the entire universe. Countless images flashed through his mind, gradually turning into a vast emptiness, and a voice rang in his mind. Nie Yan didn't know what it was saying, but he felt that the voice was exceptionally solemn and peaceful, eliminating the distractions in his heart.

After an unknown amount of time, another system prompt sounded.

System: Do you decide to accept the guidance of the gods, change your class to Saint Shadow Dancer, follow the will of the gods, and cleanse the world of all evil?

Upon receiving this system prompt, Nie Yan's heart skipped a beat. He could already change his class to Saint Shadow Dancer?

He was surprised that the class change was so quick. He was ecstatic and clicked confirm without hesitation.

A dazzling white light shone from his body, and then, strands of brilliant light condensed on Nie Yan's left shoulder, gradually merging together.

What exactly was happening? Nie Yan felt a little surprised in his heart. He felt that within this white light, a life form was being born.

After a while, a palm-sized figure slowly emerged. Nie Yan looked at it. This was a tiny angel. She looked holy and beautiful, with bright eyes, draped in a white veil, every inch of her skin was delicate to the extreme, and she had a pair of white wings on her back. The little angel hovered near Nie Yan's left shoulder, constantly fluttering her wings.

Her eyes looked at Nie Yan with agility and curiosity, as if her eyes could speak.

"Saint Shadow Dancer Nie Yan, Kalenna will become your guardian angel." The angel Kalenna flapped her wings, fluttered a bit, and said. Her voice was melodious, like heavenly music.

"Hello, Kalenna," Nie Yan greeted Kalenna, and looked at Kalenna with some surprise. He was really amazed by Kalenna's appearance.

Nie Yan remembered that in his previous life, `Xiao Mo Bu Shi Wei Wo` didn't have such a guardian angel after changing his class to Saint Shadow Dancer, but he didn't know what effect this guardian angel had.

Nie Yan looked at his own status. His title had changed from Great Thief to Saint Shadow Dancer.

Nie Yan checked the rewards of the Saint Shadow Dancer. The Saint Shadow Dancer had three more powerful passive skills. One was Holy Healing, which increased the health recovery speed of himself and all teammates around him by 300%. The second was Resurrection, which gave him a chance to revive after death, with a cooldown time of two natural days. The third passive skill was Dodge, which could be upgraded. The first level increased dodge rate by 20%, meaning that for every ten attacks Nie Yan received, he could dodge two of them. The dodge rate could be increased to a maximum of 50%.

These three skills greatly enhanced Nie Yan's strength.

The additional status of Saint Shadow Dancer was that all attributes were increased by 30%. In addition, as the first player to change his class to Shadow Dancer, Nie Yan could also go to the Thieves Guild to receive additional rewards.

Besides these, Nie Yan found that the Saint Shadow Dancer's mission was not completed yet. Only about 30% of the Saint Shadow Dancer's abilities had been released, and there were some more missions in his mission bar.

Mission Progress 5: The undead and the Mo race in the underground are starting to stir again. Damn undead and Mo race, they never stop thinking about destroying humans. Go talk to the Archangel Tyrol.

Seeing this Mission Progress 5, Nie Yan was a little surprised. He actually had to go to the Archangel Tyrol. In the Greenland Empire, the Archangel Tyrol was almost like a god. It seemed that the follow-up missions of the Saint Shadow Dancer were definitely extraordinary, and related to the underground undead and the Mo race. Could it be a main quest affecting the course of history?