Who is he?

"A-Are you alright, Aether?" Aria asked, her voice trembling with concern. She glanced at Aether, who seemed mildly disoriented before he shook his head and frowned. "What... happened?" he muttered. The last thing he remembered was his vision suddenly blinding and then feeling dizzy, similar to when he used the teleportation...

"Teleported?" Aether asked, doubt creeping into his voice. Aria sighed in relief and nodded. She was immensely grateful she had leapt towards him with all her might when she noticed the teleportation circle forming around the carriage.

Aether took a deep breath and patted Aria reassuringly before getting up. He looked around, taking in the surreal landscape that surrounded them. It was a vast, empty plain, and...

"End of the world..." Aria mumbled, her eyes widening as she saw the edge.