The catacombs under Ba Sing Se felt alive. Green crystals pulsed faint light across the ancient walls, throwing long shadows over Robert's armor. Every step echoed like a heartbeat—his, or the city's.
Azula moved ahead of him, silent, confident, every gesture dripping with control. Mai and Ty Lee flanked the rear, scanning for movement. Above them, the Earth Kingdom's greatest fortress was falling without anyone realizing it.
They weren't expecting to find the Avatar himself here.
---
The Confrontation
The air grew hotter as the tunnels opened into a vast chamber. Zuko stood on the bridge, torn between anger and doubt. Katara was with him, water already swirling at her fingertips.
Robert recognized her—one of the faces they'd been hunting for months. His black fire flared faintly in his palms, reacting to his pulse. Azula raised a hand to stop him.
"Patience," she whispered. "Let the moment break first."
Then, with a voice that could slice steel, she called out:
"Zuzu. I've missed you."
The fight that followed was chaos—beautiful, terrifying chaos.
Blue and black fire intertwined, hissing against streams of water and gusts of air. Robert ducked an earth spike, flipping forward, sending a trail of black flame along the stone. The heat shimmered violet where his fire mixed with Azula's blue. Together, they moved as if they had trained for years—her lightning striking high while his dark fire snaked low, cutting off escape.
Katara threw a torrent of water. Robert raised his hands, the flames around him dimming to deep violet. The water hissed, steam clouding the room. Through it, he saw the Avatar—Aang—glow faintly with the first signs of the Avatar State.
So this is the power we've been chasing.
Aang's energy burst like a storm, knocking everyone back. Robert hit the ground hard, the wolf mask cracking across the jawline. His vision blurred, but he pushed up again, his black fire crawling over his arms like living ink.
Across the chamber, Azula struggled to her feet. She looked at him—not for orders, not for power—but for trust. He nodded once.
Together, they attacked.
---
The Fall
Azula's lightning struck Aang as he rose. The glow of the Avatar State flickered out, and silence fell like thunder after a storm. Katara screamed his name, rushing forward, cradling him as his tattoos dimmed.
Robert lowered his hand. His black fire faded, smoke curling off his armor. For a long moment, he couldn't breathe. The fight was over—but it didn't feel like victory.
Azula turned to him, chest heaving. Her golden eyes glowed faintly in the crystal light. "You see, Robert? This is what it means to rule through power."
He stared back, his voice low. "Power's easy. Control's harder."
Something flickered across her face—an emotion she rarely showed. Admiration. Maybe something more.
Mai and Ty Lee approached quietly. "The Dai Li are moving in," Mai said. "Ba Sing Se is ours."
Azula straightened, smoothing her hair back into place, regaining that familiar composure. But before she left, she glanced at Robert again.
"You fought well," she said softly. "Without you, the city might still stand."
Robert touched the cracked wolf mask and smirked beneath it. "Guess I'll need a new one."
Azula's lips twitched. "Keep it. Let them remember the man with the black fire."
---
Aftermath
Night fell over Ba Sing Se. The walls no longer looked indestructible; banners of red and gold fluttered where green once hung. In the palace courtyard, Robert stood beside Azula, watching torchlight dance on the stones.
The world below the wall slept in uneasy peace. He wondered if anyone could feel the shift—the end of one age, the beginning of another.
Azula stood next to him, closer than before. "You were born for this," she said quietly. "For war. For conquest."
He looked at her, voice calm. "Maybe I was reborn for something more."
For once, she didn't argue. She just looked at him, the faintest smile hidden in her eyes.
"Don't make me regret trusting you, Robert Jackson."
He met her gaze. "Wouldn't dream of it, Princess."
---
The Fire Nation had claimed Ba Sing Se. But deep in the shadows of the crystal catacombs, the boy with the black fire knew his path was only beginning.