With the core now stabilized, Amara and Kael faced a new challenge: what to do with the knowledge they had uncovered. The secrets of the sunken city held the potential for both salvation and ruin.

"The city's technology could change everything for our people," Amara mused, her gaze lost in the flickering flames of their campfire. "But if the wrong hands seize it, we could be looking at another downfall."

Kael nodded, the weight of responsibility evident in his furrowed brow. "We can't let fear dictate our actions. We have a chance to make things right, to use this knowledge for good."

The debate raged long into the night, the two of them wrestling with the implications of their discovery. To share or to conceal—their decision carried the weight of history.

In the end, it was the melody of the shell that guided them. The song, once a haunting reminder of loss, now seemed to resonate with a message of hope. It was a call to learn from the past, to build a future that honored the lessons learned from the city's tragic tale.

"We'll start small," Amara decided. "We'll use the technology to help our tribe, to show them that it can be a force for good."

Kael agreed, his determination matching Amara's. "And we'll be careful. We'll ensure that the power is shared, that no one person can control it."

They set to work, using the salvaged technology to create a sustainable energy source for their tribe. It was a delicate process, one that required patience and precision. But as the days passed, their efforts began to bear fruit.

The tribe watched in awe as lights flickered to life, powered by the sun's energy harnessed through the wisdom of the ancients. It was a small step, but it was a step towards a future where the mistakes of the past were not repeated.

Amara and Kael's choice was a testament to their belief in the power of change, in the possibility of a new dawn. And as the sun rose over the Sand Sea, it cast its light on a world that was ready to sing a new song.