[If you have not read up to chapter 10, minor spoilers ahead. But note the information presented is according to what the characters were taught. This means there will be things they don't know and things they know that are contrary to what is true. Lastly, you do not need to know nor memorize this information to enjoy the story though for some of you it might help.]
Sigils are powerful letters tied to fundamental concepts that shape the world. Each sigil is linked to a sigil stone, an artifact held by an individual, family, or organization. Below is a list of all known sigils, their meanings, and the current holders of their sigil stones:
Alpha (α) – Creation (Specific) Sigil Stone Holder: Slayer School
Beta (β) – Citrinitas [Illumination] (Generic) Sigil Stone Holder: The Alchemists (Currently ruled but Thalassa Hydris)
Gamma (γ) – Release (Generic) Sigil Stone Holder: The Zephyros Lineage
Delta (δ) – Ethereal (Specific) Sigil Stone Holder: Slayer School
Epsilon (ε) – Nigredo [Decomposition] (Generic) Sigil Stone Holder: The Alchemists (Currently ruled but Thalassa Hydris)
Zeta (ζ) – Zero [No Effect] (Generic) Sigil Stone Holder: Leonhard Euler, the Strongest Slayer
Eta (η) – Control (Specific) Sigil Stone Holder: The Khronos Family
Theta (Θ) – Sulfur [Combusting] (Specific) Sigil Stone Holder: The Ferran Clan
Iota (ι) – Wind [Diffusion] (Specific) Sigil Stone Holder: The Zephyros Lineage
Kappa (κ) – Water [Phase Changing] (Specific) Sigil Stone Holder: The Alchemists (Currently ruled but Thalassa Hydris)
Lambda (λ) – Mercury [Dissolving] (Specific) Sigil Stone Holder: The House of Argyris
Mu (μ) – Earth [Crystallization] (Specific) Sigil Stone Holder: The Terran Guild
Nu (ν) – Fusion (Generic) Sigil Stone Holder: Unknown
Xi (ξ) – Intensifying (Generic) Sigil Stone Holder: Slayer School
Omicron (ο) – Time (Generic) Sigil Stone Holder: The Khronos Family
Pi (π) – Limiting (Generic) Sigil Stone Holder: The Zephyros Lineage
Rho (ρ) – Growing (Generic) Sigil Stone Holder: Slayer School
Sigma (σ) – Summoning (Generic) Sigil Stone Holder: Slayer School
Tau (τ) – Infinite [Endless Effect] (Specific) Sigil Stone Holder: Leonhard Euler, the Strongest Slayer
Upsilon (υ) – Albedo [Purification] (Generic) Sigil Stone Holder: The Alchemists (Currently ruled but Thalassa Hydris)
Phi (Φ) – Tangibility (Generic) Sigil Stone Holder: Slayer School
Chi (χ) – Absorption (Generic) Sigil Stone Holder: Unknown
Psi (ψ) – Rubedo [Inversion] (Generic) Sigil Stone Holder: The Alchemists (Currently ruled but Thalassa Hydris)
Omega (Ω) – Destruction (Generic) Sigil Stone Holder: Unknown
Sigil Catagories
Transfiguration Sigils (All Generic):
Beta (β) – Citrinitas [Illumination]
Epsilon (ε) – Nigredo [Decomposition]
Upsilon (υ) – Albedo [Purification]
Psi (ψ) – Rubedo [Inversion]
Elemental Sigils (All Specific):
Iota (ι) – Wind [Diffusion]
Kappa (κ) – Water [Phase Changing]
Lambda (λ) – Mercury [Dissolving]
Mu (μ) – Earth [Crystallization]
Theta (Θ) – Sulfur [Combusting]
Slayer School Sigils:
Alpha (α) – Creation (Specific)
Delta (δ) – Ethereal (Specific)
Xi (ξ) – Intensifying (Generic)
Rho (ρ) – Growing (Generic)
Sigma (σ) – Summoning (Generic)
Phi (Φ) – Tangibility (Generic)
Family Guarded Sigils [Holder]:
Gamma (γ) – Release (Generic) [The Zephyros Lineage]
Eta (η) – Control (Specific) [The Khronos Family]
Pi (π) – Limiting (Generic) [The Zephyros Lineage]
Omicron (ο) – Time (Generic) [The Khronos Family]
Lost Sigils {How it was lost}:
Zeta (ζ) – Zero [No Effect] (Generic) {Lost to the Strongest}
Nu (ν) – Fusion (Generic) {Lost to Time}
Tau (τ) – Infinite [Endless Effect] {Lost to the Strongest}
Chi (χ) – Absorption (Generic) {Lost to Time}
Omega (Ω) – Destruction (Generic) {Was never found}
Fire and Heat Manipulators;
These monsters harness fire and heat, with their power and intelligence increasing alongside flame manipulation abilities.
White-Class: Salamanders - Small, ember-covered lizard-like creatures that emit faint heat and breathe sparks causing burns. Agile and difficult to catch.
Light Grey-Class: Hellhounds - Black, spectral dogs with flaming eyes and faint blazes along their bodies. Use smoke to obscure vision and create fire rings for entrapment.
True Grey-Class: Ifrits - Smoke-bound humanoids capable of summoning fire around themselves and projecting intense heat. Vulnerable to water.
Dark Grey-Class: Dragonborns - Draconic humanoids with scales and horns. Limited fire-breathing abilities and can unleash area-wide flame blasts. Tactical intelligence makes them formidable.
Black-Class: Phoenixkin - Fiery humanoids with bird-like wings. Capable of creating firestorms and regenerating through self-combustion. Exceptionally intelligent and adaptive.
Vision and Perception Monsters;
These monsters are renowned for their foresight, multiple eyes, and heightened perception abilities.
White-Class: Argus Beetles - Beetle-like monsters with a single large eye for a head. Detect movement in all directions and evade basic attacks.
Light Grey-Class: Cerberus Pups - Three-headed dog-like creatures with enhanced sensory awareness and predictive abilities for nearby threats.
True Grey-Class: Beholders - Floating heads with a central cyclops-like eye and ten smaller eye stalks. Foresee attacks seconds in advance, making them hard to ambush.
Dark Grey-Class: Hecatoncheires - Tall humanoids with dozens of eyes that predict movements up to a minute ahead. Highly challenging in close combat.
Black-Class: Cyclopean Sages - Mystical beings with eyes covering their bodies. Perceive multiple future possibilities and manipulate events to achieve their goals. Nearly impossible to surprise.
Shape-Altering Monsters;
Inspired by legends, these monsters excel in disguise and deception, adapting their forms to evade or outwit attackers.
White-Class: Mimics - Amorphous creatures replicating objects for blending or ambush.
Light Grey-Class: Doppelgängers - Ghostly figures that replicate humans perfectly, including their controls but not sigils. Transformation takes time and results in a loss of gained knowledge and control.
True Grey-Class: Rakshasas - Humanoids that shapeshift body parts into animal forms. Can create larger-than-life animal limbs or combine animal traits for combat advantages (e.g., tentacles covered with razor-sharp teeth).
Dark Grey-Class: Jinn - Intelligent humanoids capable of all the abilities of lower classes with near-instantaneous shapeshifting speed.
Black-Class: Leshy - Near-perfect humanoids from Slavic mythology. Flawlessly replicate human forms, including controls, but lose gained controls and sigils upon transformation. Shapeshifting is instantaneous and does not affect retained knowledge.
Extra information:
There are about 30 black slayers, 120 dark grey slayers, 550 grey slayers (half of them are in their third), 2800 light grey slayers (all which either in their third or second year) and 40000 white slayers (which includes second years and first years who make it to their second term).
[Thanks for checking out the world of sigils and monsters! Hopefully, this has sparked some ideas for your own Slayers—heroes with unique powers and personalities to take on these challenges. Feel free to imagine how they'd use sigils, face off against terrifying monsters, and carve out their place in this world. Don't hold back—go wild with your creativity and have fun building your own stories.]