Black Celestial Sword — My Vampire System

The Black Celestial Sword is a sentient black blade given to Layla by Longblade. It suppresses energy where it makes contact, carries the trapped consciousness and power of a being who once opposed Immortui, and later receives Quinn's celestial mark. Its extraordinary output is balanced by mental pain, bodily strain, and a hostile influence that most wielders cannot safely endure. (Chapters 1179–1184, 1538–1569, 1776–1782, and 1881–1883)

History

Longblade obtains the sword after encountering weaker beasts carrying it rather than defeating a known creator or owner. He treats it as a prized weapon and offers it to Layla in gratitude for healing him after the fight with Pure. Layla begins testing it aboard the Cursed ship and finds that it disrupts powers at the point of contact. Because Longblade does not know the blade's deeper origin, its maker, original name, and path into the beasts' possession remain unconfirmed. (Chapters 1179, 1182, and 1184)

Layla initially uses the weapon as both a sword and a countermeasure against abilities. During the Dalki war, it reveals a voice that draws on the negativity around her, takes control of her movement, and forces attacks through opponents she cannot defeat independently. Those interventions help her wound Helen, contest the demon-tier dragon, and cut through attacks that would otherwise overwhelm her, but they also bring screams, headaches, loss of bodily control, and ever-shorter safe periods of use. The weapon's benefits therefore create a dependency Layla repeatedly tries to replace with trained Qi, archery, and Hannya control. (Chapters 1184–1197, 1538–1569)

Across the following millennium, the sword develops or reveals a bow form and celestial power. Layla channels its energy while fighting Laxmus and forms a life-force Qi arrow capable of leaving wounds that do not heal, but the discharge permanently reduces part of her cultivated reserve and leaves her unable to sustain the weapon's power. The sword itself urges her to stop rather than die, showing that its voice can act protectively even while its power remains dangerous. (Chapters 1709, 1776–1782)

After Layla reunites with Quinn, she gives him the sword to investigate. The consciousness inside says a “God of Death” tricked and sealed him in the blade; Quinn infers a connection to the power behind the original vampires, but the speaker's incomplete memories prevent a definitive origin. Quinn removes the existing mark at substantial celestial cost, then applies his own mark and returns the sword to Layla under an agreement that its inhabitant will protect her. The system calls it a God Slayer Sword during that process, but Quinn cannot release the consciousness into a new body and does not establish whether the artifact itself meets every later definition of a god-slayer item. (Chapters 1880–1883)

Russ becomes a temporary wielder when Layla is incapacitated during the rescue campaign. Touching the sword blocks his usual ability, so he accesses its memories without holding it and reproduces the form of its original inhabitant—the Black Swordsman. In that form, Russ can carry the sword without suppressing his copied power and draw out far more of its technique, defeating Pine while spending his own limited MC cells. His success demonstrates compatibility through imitation rather than permanent ownership; he drops the weapon when the transformation ends and later continues to use the Black Swordsman's remembered form in major battles. (Chapters 2237–2240, 2366–2367, and 2415)

Properties and use

The blade negates or disperses energy at its surface. A user cannot gather Qi, telekinesis, or another ability through the limb touching it, and attacks that strike the sword directly can be cut, absorbed, or rendered ineffective. The effect is local rather than a general nullification field: flames and force that travel around the blade can still hit its wielder, while an opponent's body remains active away from the contact point. This makes placement and sword skill essential even against powers the weapon can suppress. (Chapters 1184–1197, 1265–1266, and 2240)

The trapped Black Swordsman supplies combat power, memories, and a voice. Drawing on that power exposes a wielder to the pain and emotions bound into the sword; previous users are said to have gone mad. Layla's Hannya nature gives her unusual tolerance because negative emotions already feed her transformation, but prolonged use still blackens her veins and eye, fills her mind with screams, and threatens to consume her. Russ bypasses part of this mismatch by copying the inhabitant's original form, though the transformation instead strains his finite MC-cell reserve. (Chapters 1538–1569, 1776–1787, 1881, and 2239–2240)

In its celestial state, the weapon lends celestial energy and can transform from sword to bow. Layla combines that output with her own Qi, spiritual effects, telekinesis, and life force rather than receiving a cost-free projectile from the item. Quinn's replacement mark subdues some of the earlier pressure and allows Layla to use the blade more normally, but it does not remove its memories or make full output safe. The sword also appears to shield Layla from the later mass alteration of memory, although the corpus does not explain the exact mechanism or establish the maximum protection it can provide. (Chapters 1776–1782, 1881–1883, 1995, and 2003–2005)

The weapon's later feats depend heavily on its bearer. Layla is its sustained owner and most compatible natural wielder, while Russ's copied Black Swordsman form releases greater sword technique for a limited time. Neither case establishes unlimited power: Layla can be physically overwhelmed or consumed, and Russ can exhaust the ability resource maintaining his imitation. (Chapters 1782–1790, 2239–2240, and 2415)

Associated characters

Layla: Layla receives the sword from Longblade, endures its influence across a millennium, and learns to combine selected portions of its power with her own archery, Qi, and Hannya abilities. (Chapters 1179–1184, 1538–1569, and 1776–1783)
Russ: Russ uses the sword's memories to copy its original inhabitant and wield the blade in the Black Swordsman form, trading Layla's emotional compatibility for a severe MC-cell cost. (Chapters 2239–2240, 2366–2367, and 2415)
Quinn Talen: Quinn investigates the consciousness inside, removes its earlier celestial seal, and places his own mark on the sword to support Layla without marking her directly. (Chapters 1880–1883)

Longblade is the blade's earlier known holder and the person who transfers it to Layla, but the corpus does not identify him as its creator or establish that he accessed the sentient power she later uses. (Chapters 1179–1182)