Each Decan represents a fundamental aspect of magic and reality. There could always be more, but these are the ones listed in the old tomes of Thaumatology.
- Agchonion -- Sound, Music, Noise
- Akhouiy -- Luck, specifically dumb luck and random fortune
- Akton -- Catharsis and destruction
- Alath -- Rest, respite
- Alleborith -- Pure magic. Raw, difficult to specify, but full of possibility.
- Anartreth -- Motion, speed
- Anoster -- The Unknown; the void which precedes creation; the clean slate of a meditating mind
- Arotosael -- Creation/Destruction
- Atrax -- Light and Sustenance
- Axiopheth -- Weight and Binding
- Barsafael -- Secrets
- Belbel -- Pure evil, cruelty
- Bianakith -- Body and fitness
- Buldumech -- Money and wealth
- Charchnoumis -- Animals
- Eneuth -- Fire, passion
- Harpax -- Plants
- Hephismereth -- Nothingness
- Ieropael -- Earth, physicality
- Isro -- Air, science
- Iudal -- Boundaries
- Kumeatel -- Hidden things
- Kurtael -- Death and decay
- Mardero -- Rebellion, change through violence
- Methiax -- Raw creation
- Naoth -- Communication
- Nefthada -- Pleasure and sensation
- Ouare -- Constructs and machines
- Phoubel -- Illumination and darkness
- Phthenoth -- Healing and restoration
- Roeled -- Strength, sturdiness, hardness
- Ruax -- Willpower and dreams
- Sahu -- Hunting, herding, mobile living
- Saphathorael -- water, philosophy
- Sphandor -- Thoughts and senses
- Tepsisem -- Decay, and the gothic appreciation of decay