Seeing Wan lose to Vaatu set the emotions Raava had carried over to her spirit form on fire. Every time Wan slammed into the ground with a painful groan, she wanted to rush out to his side. However, that would have made his statement meaningless: "If you want to get to her, you'll have to go through me!" Then, he called out to her. She could not have taken off faster. He clenched his teeth, preparing for her powerful wind to knock him over like it had the first time. He tightened his fists, getting into a crouch as her power settled in.
Vaatu attacked, but Wan was ready. Remembering his training, Wan used all four elements to strike at the dark spirit. So fast, so agile, Wan held a dark, determined look in his eyes. That is when his strength started to vanish. He slid to the ground, his hands and feet slowing his skid. He could feel his energy draining and his heart pumping in pain.
"I have to leave you. If I stay any longer," Raava tried not to sob, "you will die."
"It doesn't matter," Wan strained. "If you leave me now, Vaatu will destroy everything. We have to finish this together." Raava felt his body giving out on him the more he kept going.
"Wan, stop," she begged. He coughed and squeezed his eyes shut. Vaatu grabbed him by the waist and swung him up into the air, firing his power at him. Wan landed near one of the portals, not being able to get up quick enough before Vaatu held him down with a tendril. Raava shivered inside of Wan. Was this it?
"The Harmonic Convergence is about to begin," Vaatu proudly announced. "The Era of Raava is over." Wan gazed in amazement as the two streams of portals bent and connected above the giant tree. Vaatu lit up with power, but so did Raava. Wan reached towards the portal behind him and looked back at Vaatu as Raava's blue spread over his body.
"I remembered seeing you touch the portal," he thought to her. "I wondered what would happen." He fell to his hands and knees.
"Wan!" Raava screamed inside of him. "Wan, I can't get out!" His heart- He was failing. He was dying faster and faster. "WAN!" He hurled up to face the sky and let out a scream that sent light firing from his body.
"Wan," she cried as he stood up, shining with her power. "We are bonded forever."
"Congratulations," the Voices of the Portals whispered. "Human, we deem you Avatar. As you said when you locked Vaatu away, you will be the bridge between the two worlds, the one to balance all conflicts."
Wan stepped out of the portal. Raava was still crying inside of him. "Wan, this is it," she told him. "This is the start of a new era. Your era."
"Come on, Raava," he snickered. "It's the start of our era." And with that, he took his first steps as Avatar.