Mount Tsukikage did not test strength.
It tested memory.
The forest surrounding the Nightfall Corps' training grounds was known among hunters as The Listening Wood. It was said that trees grown in soil soaked with blood remembered sorrow the way old men remembered war.
Renjiro stepped into that forest at dusk, the air thick with fog and pine resin. The exam for advancement had begun. No announcements. No ceremony. Only silence.
The silence pressed against his ears.
His breath rose slowly. Inhale. Exhale.
Resonant Breathing was no longer just technique. It was confrontation.
Each step forward seemed to awaken something unseen.
Behind him, other trainees moved cautiously. Somewhere to his left, Toma muttered anxious complaints under his breath, trying to disguise fear with humor. Even in darkness, he found ways to whisper about how unfair it was that "monsters had such complicated emotional backstories."
Renjiro almost smiled.
Almost.
But the forest shifted.
The temperature dropped.
And then he felt it — not a presence, but a weight.
Grief.
It saturated the air like mist.
The Nightborn emerged slowly from between the trees. Unlike the one he had faced before, this creature did not weep. It stood tall, skeletal fingers twitching, its face elongated and hollow, eyes deep crimson voids.
Its sorrow had long ago hardened into bitterness.
Renjiro understood immediately: this was not a demon created from sudden tragedy.
This was decades of resentment.
And resentment was far more dangerous.
The creature's voice echoed not in the air, but inside the mind.
They left me behind.
The words were not spoken aloud, yet every trainee felt them.
Renjiro's heart stuttered. For a brief, fragile moment, he saw himself in that bitterness — the quiet anger he had buried beneath kindness. The unfairness of returning home too late. The uselessness of apology when no one remained to hear it.
His breath destabilized.
That was the danger.
Nightborn fed on unregulated resonance. If his grief spiked uncontrolled, the creature would amplify it.
He steadied himself.
Not by suppressing the pain.
But by allowing it.
He remembered his mother's warmth. His siblings' laughter. Akari's stubborn smile even before her transformation. The grief softened.
Grief did not disappear.
It became love with nowhere to go.
And love, when directed properly, did not corrode.
It strengthened.
His stance shifted.
Crimson light traced faint patterns along his blade.
The creature lunged with terrifying speed. The clash echoed through the trees, steel against claw, breath against distortion.
The forest seemed to watch.
Renjiro did not fight to destroy.
He fought to release.
Each motion of his blade flowed not from rage, but from understanding. He moved as though guiding a lost soul toward its end.
When the final strike came, it was almost gentle.
The Nightborn dissolved into drifting ash.
For a fleeting second, the bitterness left its face, revealing a tired old man who had once simply wanted not to be forgotten.
The fog thinned.
The forest exhaled.