Two nights after joining the Null Order, Jiwoon sat alone in the armory, inspecting a sealed black case Mira had reluctantly given him.
"We found this after your fight with Reaper-01," she had said.
"It's… resonating with your Sin."
The moment he touched it, the case unlatched.
Inside was a weapon like no other — a black curved blade, pulsing with faint red veins. Its hilt bore the mark of a two-headed dragon entwined with a Kirin's horn.
[Item Identified: Sinbound Relic – "Nyxfang"]
A Blade That Speaks
As soon as Jiwoon gripped it, his vision blurred.
The world froze.
He stood in a void, and the blade spoke.
"You are no longer a pawn. But are you ready to be a tyrant?"
"What are you?" Jiwoon demanded.
"A part of you. Forged by your hatred. Sharpened by your guilt."
"Feed me your judgment. Or I'll feed on your soul."
When Jiwoon blinked, he was back — sweating, the blade warm in his hand.
"Great," he muttered. "Another voice in my head."
Sin-Surge Trial
To wield Nyxfang, Jiwoon had to bond with it.
And to do that, he had to survive a ritual known as the Sin-Surge Trial.
Deep beneath the city, in the catacombs of forgotten sinners, Mira and the Null Order guided him into a black chamber lit only by flickering sigils.
"Whatever you see in there," Mira said, "it's from you. It's you."
Visions of Regret
Inside, Jiwoon faced illusions born from his past sins:
The ghost of a child he failed to save.
A girl whose father he judged too quickly.
His own reflection—eyes red, smiling cruelly.
"You kill to punish," the reflection whispered, "but you also kill to feel in control."
"No," Jiwoon snarled. "I kill so others don't have to."
"Then why do you smile every time it hurts?"
He raised Nyxfang and slashed through the mirror-self.
The Bond Complete
[Sin-Surge Trial Complete]
Weapon Bonded: Nyxfang – Level 1
Passive Ability Unlocked: Shadow Echo
(Mirrors damage dealt to sinners over 30% Sin corruption)
Mira helped him out of the chamber.
"You passed," she said.
"Barely," Jiwoon replied. "But this blade… it knows me too well."