In a world filled with ink and darkness, two extraordinary beings prepared for an epic showdown. Ink Sans, the protector of the AUs, stood tall, his giant Inc. brush in hand.

Across him, Error Sans' blue strings danced in the air, a chilling sight even in the blackest of nights. His eyes, a gateway to his soul-capturing powers, glowed menacingly.

Ink Sans stared at his opponent, his emotionless eyes hiding a storm of determination. He swung his brush, ready for the impending battle.

Error Sans smirked, his strings pulsating with anticipation. He summoned his gaster blaster, preparing to fight.

The first clash was loud and powerful. Ink Sans' brush met Error Sans' blaster, creating a spark that lit up the dark world.

Error Sans retaliated, his blue strings lashing out. But Ink Sans was quick, his brush deflecting the deadly strings.

Ink Sans swung his brush, releasing a barrage of black bones. Error Sans dodged them, his gaze never leaving his opponent.

The battle raged on, each combatant matching the other's strength. The tension was palpable, the stakes higher than ever.

Suddenly, Ink Sans saw an opening. With a swift movement, he managed to trap Error Sans with his brush.

However, Error Sans was not defeated yet. He wriggled free, his blue strings cutting through the ink.

Ink Sans didn't let the setback deter him. He continued his onslaught, his determination unwavering.

Error Sans, on the other hand, was growing weary. His attacks became less frequent, his movements slower.

Ink Sans saw his chance and took it. He swung his brush, hitting Error Sans squarely.

As expected, the brush did not harm Error Sans, but it did change him, making him weaker. Ink Sans had the upper hand now.

Despite his weakened state, Error Sans refused to give up. He summoned all his energy, preparing for one last attack.

But Ink Sans was ready. He stood tall, his eyes filled with determination, ready to defend the AUs at all costs.

Error Sans attacked, his blue strings lashing out furiously. But Ink Sans was faster, his brush deflecting every attack.

With a final swing of his brush, Ink Sans defeated Error Sans. The world was silent as the latter fell, defeated and drained.

Ink Sans stood victorious, the protector of the AUs. He looked at the defeated Error Sans, his emotionless eyes softening slightly.

Error Sans lay defeated, his blue strings fading away. His eyes, once filled with destruction, now held a hint of regret.

Ink Sans, despite his victory, felt no joy. He turned away, his task done. The battle was over, but the war was far from finished.

The world of ink and darkness slowly started to regain its colors, the menacing blackness replaced by hopeful shades. The AUs were safe, for now.

Ink Sans disappeared into the night, his duty done. He would return, ready to protect the AUs whenever they were threatened again.

Error Sans, left alone in the darkness, looked at the sky. He was defeated, but not destroyed. He would rise again, ready for another battle.

The world held its breath as the two beings disappeared. The Battle of Souls had ended, but the story was far from over. It was just the beginning.