This system is shared and fully integrated across the worlds of High School DxD, Shinmai Maou no Testament, Rosario + Vampire, and Fate, existing above direct political disputes and acting as a silent pillar that maintains balance among all factions.
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1 Lucif (Ⱡ)
The Currency of Survival and Hierarchy
Lucif is the official circulating currency of the Underworld, used in everyday demonic life. It represents the structural power of the Underworld and sustains its basic economy.
Appearance:
Circular coins forged from Infernal Iron, a metal cold to the touch with a dark bluish-black hue. At the center, a magical circle is engraved, emitting a faint red glow when the coin is legitimate.
Where it circulates:
Exclusively within the Underworld and among demons residing in the human world. It is used for food, housing, basic services, and internal trade.
Cultural value:
For a demon, possessing large amounts of Lucif signifies efficiency, survival, or influence within the demonic hierarchy.
2. Essentia (✧)
The Diplomatic and High-Value Currency
Essentia was created after the peace pact between major supernatural factions. It is considered a stable currency, accepted throughout nearly the entire hidden world.
Appearance:
Faceted crystals in an octahedral shape, transparent and constantly emitting a white-blue glow.
Where it circulates:
International trade between factions
Black markets for sacred and cursed items
Purchase of legendary weapons, artifacts, and elite contracts
Exchange rate:
1 Essentia (✧) = 100 Lucif (Ⱡ)
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3. Underworld Banks
There exist 1 internal Underworld banks, controlled directly by the Great Demonic Families. They have no official support from the International Bank.
True function:
Economic control over low-, middle-, and high-class demons without noble backing or political authority
Abusive debt systems
Constant financial surveillance
These banks exist solely to subjugate demons who lack family support or political protection. They enforce dependency through contracts and debt. A restrictive rule also exists: demons below High-Class are forbidden from leaving the Underworld. Those who wish to reside in the human world must sign binding contracts and obtain the explicit support of one of the Four Great Satans. Without such backing, these demons are barred from opening accounts in the International Bank.
3. International Bank of the Supernatural
The Absolutely Neutral Authority
The International Bank of the Supernatural was founded before the Great War, through a primordial alliance involving:
Lucifer
God
Azazel
Pantheons: Greek, Shinto, Yōkai, Norse
Elves, vampires, magi, and other ancient factions
Each world (High School DxD, Shinmai Maou no Testament, Rosario + Vampire, Fate) possesses its own administrative division within the bank, all functioning under a single neutral system.
The bank cannot be manipulated by any entity—divine, demonic, or otherwise.
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4. Structure of the International Bank
Located in a separate, indestructible dimension
Cannot be invaded, destroyed, erased, or sealed
Operates through an extremely advanced self-aware system
Automatically updates its internal laws and functions every 100 years
Guardians
Ancient entities similar to dwarves or goblins (Gringotts-like), created by the system itself:
Feel no fear, ambition, or political loyalty
Exist solely to protect the bank and preserve monetary balance
Capable of performing investments and financial operations across all currencies—though no faction is aware of the full extent of these abilities
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5. Vault System Universal Access
Any conscious being with knowledge of the supernatural may create a vault:
Demons, vampires, angels, magi, spirits
Humans aware of the supernatural world
The bank does not discriminate based on race, power, or status.
Vault Tiers
Low-Level Vault
Annual fee: 10 Essentia (✧)
Mid-Level Vault
Annual fee: 50 Essentia (✧)
High-Level Vault
Annual fee: 1,000 Essentia (✧)
Elite Vault
Annual fee: 10,000 Essentia (✧)
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6. Free Vaults
Granted exclusively to the original founders of the bank pact and their direct bloodlines, under strict and non-transferable conditions.
Absolute Vault
Value is immeasurable and defined individually by the bank
Non-negotiable
Access restricted to:
Sovereign great factions
Kings and rulers of realms
Supreme generals
Legendary heroes and elite-class champions
Mythical assassins across DxD, Shinmai, Rosario, and Fate
Supreme magi of all four worlds
Exceptionally wealthy supernatural or human families
Even so, the bank reserves the right to deny access without explanation.
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7. Fundamental Rules
No vault may be accessed by third parties
Not Satans, gods, councils, nor kings are exempt
Access is bound strictly to the registered individual or reigning leader, verified through blood-based authentication
The International Bank of the Supernatural is the sole authority
The bank does not judge morality. It merely observes, records, and preserves balance. Any pact, contract, or large-scale transaction involving Essentia must be registered through the bank, which forges the binding contract. The involved parties need only sign and seal it with blood.
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One or two chapters will be released later; I'm adding some information so there's no confusion.