Since Kyoshi island, the gang had run into a few little adventures. They rode the mail chutes of Omashu, got captured and taken to the King who happened to be Aang's old friend Bumi who challenged Aang to complete three tasks otherwise Thyra, Sokka and Katara would be consumed by creeping crystal but once Aang had figured out who his old friend was, all was well. After that Katara helped to inspire a rebellion in the Earth Kingdom villages after getting imprisoned as an earth bender then after that Aang had to save a village from an angered spirit who kidnapped people after sundown.
During his trip into the spirit world the dragon of Avatar Roku took Aang to see an island in the fire nation where he was given a vision by the previous Avatar. It had been a pretty hectic couple of weeks. Thyra lifted her head from her pillow, listening to Aang as he tried to sneak out of the village unseen. She kicked Sokka awake then shook Katara, nodding to them.
They and the other villagers walked out into the open where Aang was trying to get Appa to move. "Let's go Appa! Come on, boy!" No matter how hard Aang tugged on the reins, Appa refused to budge, growling in protest. "Look, I'm sorry, but Katara, Thyra and Sokka aren't coming to the Fire Nation with us. If they got hurt, I'd never forgive myself." He sighed. "So get your big butt off the ground and let's go!"
"I think his big butt is trying to tell you something." Sokka called out and Aang peered around Appa in slight disbelief and guilt.
"Please don't go, Aang. The world can't afford to lose you to the Fire Nation. Neither can I." Katara said softly as Aang got up to walk towards them.
"But I have to talk to Avatar Roku to find out what my vision means. I need to get to the Fire Temple before the sun sets on the Solstice. That's today." With a hang of his head Aang walked back towards Appa and jumped up to move off but the three of them ran out in front of Appa, making him stop.
"We're not letting you go into the Fire Nation, Aang." Katara informed determinedly, folding her arms.
"At least not without your friends and your sister. We got your back." Thyra smiled up at Aang.
"It's why we're here. We're in this together. Forever and to the end." Appa growled happily then slathered his large tongue up Sokka, who squealed in protest.
"Ewwww!"
"It's a long journey to the Crescent Island." The village chief said as he handed Aang a package of supplies. "You'll have to fly fast to have any chance of making it before sundown. Good luck."
"Thank you, for your..."
"Go!" He pointed away as he ordered impatiently. Aang flicked Appa's reins and called out, giving Appa the signal to fly. They all shot forwards and Sokka instantly grabbed a blanket to wrap himself up for a few more hours of sleep. Thyra picked up several more blankets and began to hand them out. She placed another over Sokka who cuddled into it, already snoring. She then folded another couple around Katara, giving a gentle smile before climbing over to where Aang was steering.
"Here, it's pretty cold out tonight." She said, wrapping them both up before looking up to the stars. "It's strange. We've been locked in ice for a hundred years…but the stars are still the same."
"Yeah. At least they haven't changed." Aang said in agreement, looking up also. "I wonder what's going to happen to us, Thyra. I'm…I'm a little scared. I don't know what I'm supposed to do."
"That's why you have me." Thyra answered softly. "I know it's incredibly rare for the Avatar to have a sibling but I think I'm meant to be here for you, to help guide you. The duty of an Avatar is to always bring balance to the world of spirits and man. Right now there is too much man and not enough spirit in this world, it has been chased away by the control of the Fire Lord. That's your aim, to free the people of a power that overwhelms the balance." Aang sighed then leaned back into Thyra who smiled lovingly down at him and held him gently, leaning her head against his.
"I'm lucky to have a sister as great as you." Her smile grew wider before they both looked up and continued to gaze at the same stars they had always looked up to when they were a hundred years younger.