Physiology | Strengths & WeaknessesPossession | Demonic Personality Traits | Demon Subtypes

Demon Article image

IMPORTANT NOTE: Before you can role-play a Demon in Mysts of Eyr, you must first submit a Demon Standard Agreement Form.

While despised and feared for their depravity; historically, demons have been credited with bringing great change and advancements. The original Fallen Ones and their accomplice demons were said to have taught knowledge of the arts, sciences, agriculture, metalsmithing and other advancements to the human race. To this day, demons are often called upon to bring hidden knowledge and powers. Typically, this comes at a high price, as the ones who seek such things often do not hold the wisdom to use such gifts wisely.

Demons are typically plagued by a hyper-focused attention to one specific aspect of themselves, pooling everything into refining and fueling power into it. They have specific passions they cling to and tend to be very black and white thinkers. Everything is either a yes or no to them. Because of said passions, many demons become closely attached to certain locations or even individuals. Often, a demon will serve as a guardian of sorts, watching over their interests with an intensity that is unmatched by any other. No demon is without purpose. They will ally only with those of like-mind or for a specific agenda, feeding on darkness and negative energies to sustain themselves.

Many demons tend to be very strong magic users. Most specialize in certain areas of skill; the highest ranking demons will carry the greatest knowledge of the black arts. Yet, some may have no magical skill at all. Then, to the opposite effect, some demons will focus their skills in combat as their strength is unsurpassable.



Playable Demon Characters range from 18 to 4,000 years in age. (Due to the mature nature of Sin Powers, children demon characters are NOT allowed in Mysts of Eyr). They are not half-breeds and not considered ‘fallen angels’. While they are polar opposite to the Celestials, they are not the same creature. All demons share the same strengths and weaknesses.



  • Aura Appetite: In both forms, the demon can draw and ‘feed’ upon the energies of sins being committed, gaining energy and strength the more of it around and the closer that it is. For instance, a lust demon in the brothel would easily be able to take its full form, but would not be able to easily do this for any length of time around pure and chaste people (like a monastery). The aura a demon feeds upon is dependant on the sin which they are pledged to. A demon can NOT feed upon other demons.
  • Darkvision: Living in darkness of the Abyssal Plane, demons can see within total darkness. Darkvision is black and white, but is otherwise like normal sight. Demons however cannot see through magical darkness.
  • Regeneration: The standard demon possesses the ability to regenerate its own wounds ONLY in the ABYSSAL PLANE, slow healing in humanoid form (4 + posts), twice as fast in demonic form (2+ posts). If the demon is battling "bane of sin" or it is unable to draw upon the energy of its affiliated sin, regeneration slows. When a demon is driven out of the mortal plane, and moves into the Abyssal Plane (The Abyss), regeneration can begin. There is a portal to the Abyssal Plane a demon can utilize in Eyr. (Demons can also travel to the Abyssal Plane as well as take people with them, though both is a tasking process as planar travel is not a simple magic to pull off.)
  • False Form: Demons have the ability to shift into a humanoid form (human, elf or drow) in order to blend in society (3 posts). They possess a lower level of demonic power while in this form. A shift requires three posts to complete and requires the demon’s full attention to fulfil the task.
  • Power of Sin: Each demon is empowered by ONE sin. The full power is accessed in the true form, and it is lessened in the false form by one half. All magical influencing/ targeting abilities require OoC consent; maximum ability range is 20m (SL chat range), with the false form’s range to 10m. A demon can use their powers upon other demons if they so wish; though depending on each other’s sin, this can vary in effectiveness. See Demon Subtypes for the full list of sins and their related powers.



  • Holy Vulnerability: All forms are weak to holy/divine/sacred magic, artifacts, and places, causing 2 to 3 times as more damage to them as it would an average human; stepping onto holy ground is either not physically possible (they feel a barrier that prevents them from going in) or causes extreme burning pain.
  • Light Vulnerability: In contrast to darkvision, bright light – especially at night – can cause pain and temporary blindness. General sunlight causes mild discomfort, while a lit torch close to the face can overwhelm the sensitive vision. Light magic can cause 1.5 to 2 times as much damage as it would an average human.
  • Salt Vulnerability: Salt is a purifying agent and can cause rashes to severe burns, depending on the amount and length of contact. Salt lines and circles may also be used to prevent a demon from entering an area.
  • Bane of Society: You may be ostracized by your mortals, should they know what you are. You may need some tact in public.
  • Corporeal Flesh: When possessing a host for a physical form, demons suffer wounds of the flesh like any other, they cut, bleed, bones break and other physical maladies that cause pain. Regeneration is slower in humanoid form than in Demonic form. The host body also still requires the basic needs such as food, drink, sleep and shelter to remain healthy. With the ability to interact with the mortal Material Plane, a demon can produce offspring with other mortals. Those created from such a pairing are called Cambion, lesser fiends in their own right, and not approved standard character races for Eyr. Tieflings, Tanarukk, and Fey’ri are products of demonic heritage, but the corruption of the demon’s blood has thinned after several generations to only manifest visually. 
  • Shifting Limit: The Standard Eyr Demon can only shift TWICE per day (that's from humanoid to demon, from demon to humanoid).



One of the most recognizable forms of demon is the typical red skinned horned brute wandering about causing mischief and harm. These stigmas, while accurate to some demons, is not true for all. Demons take many forms; from writhing tentacles, fangs, claws, wings and horns to a normal looking human owning bestial characteristics.

Note: An Eyr Standard Demon PCs must be humanoid in appearance, and it cannot be an anthropomorph (animal or furry with humanoid traits), nor do we permit penis-tipped tentacles.

Demons have two forms - a True form and a False one. The true form is the demon as it naturally is with its twisted, abhorrent appearance revealed for all to see. The false form is a means for the demon to disguise themself so they can slip through undetected in the Material Plane to carry on their devious objectives unheeded. The demon’s false form derives from possessing a host’s body, often a human one, and utilizing their host’s appearance for this form. While the false form may have some subtle demonic elements like horns and eyes, the purpose of the form is to hide in plain sight.



OOC Note: Becoming a demon is a permissible free Race Change (Rule Addition, Oct. 2015). It is a One-Way Race Change, meaning once a PC becomes a demon, a player can not freely change their character back.

When on the Material Plane, Demons are fluid beings made up of energy. They acquire physical forms through possession. This is either done by taking over the mind entirely of a chosen mortal victim or by sharing a body with the soul of a Host. Races that are naturally abhorrent or resistant to unholiness will not be able to be possessed, such as elves and mystfolk. Only pure-blood Humans are viable targets for possession.

When a player character becomes possessed by a demon, the character begins an initial phase of rebellion where the demon and PC's character wage a battle over control of their body. During this time of internal combat, the PC can still have the demon exorcised from them safely. The race change isn't considered complete until the player character submits to the demon. While fighting for control, the character gains these attributes and abilities from the demon standard listed here:

  • Feels rejuvenated in the presence of sin and has an intense desire to encourage it in others
  • Is repelled and can feel physical pain from holiness/holywater, bright light, ritual salt, and the demon's sin bane.
  • Does Not have access to Sin Powers
  • Can Not planarwalk to the Abyss, nor would they regenerate their wounds even if they were brought there.
  • Can Not assume a demonic true form
  • If the PC dies, the PC is dead and will require a Resurrection if they so choose. They DO NOT continue playing as the demon finding a new Host. This effectively severs the demon from the character, but it's not an ideal form of exorcism for fairly obvious reasons.

The weaknesses far outweigh the strengths here on purpose. This is to encourage the character to either quickly accept the demon wholly to strengthen themselves (and complete the race change) or to quickly seek out help to exorcise the demon.

Memories and thoughts are shared between demon and the Host's spirit within reason. If the demon swiftly overrides the character and assumes complete control, they might only have fleeting glimpses of the former owner of the body they now inhabit. Demons that choose to share the Host body, might have a more intimate knowledge of the Host's persona. The Host's original spirit might be strong enough to hide certain memories and thoughts from its counterpart too. This mingling of thoughts can work against the demon too. If successfully exorcised before the permanent race change, a character might be able to skim small bits of memories from the demon that attempted to possess them.

As soon as the demon wins (either assumes complete control or the PC concedes to share their body with the demon), the race change is past the Point of No Return and becomes permanent. The player will need to fill out a Demon Standard Application for their character and will then receives all the standard's demonic abilities, weaknesses, and strengths. An exorcism performed after this point will not only purge the demon, but will also kill the mortal body as well. The Host has become too dependent on the demon to survive without. From this point forward, the character's story will follow along with the demon that now inhabits the body. Should the physical body die, the PC continues play as the demon looking to find a new Host for its corporeal form.

For a demon, flesh is disposable, but there is a great deal of risk involved to those who wish to find a new possession victim. Lacking a Host, the demon carries on in its natural incorporeal state for at least an entire RL week as it gathers up enough energy to possess a new Host. This is a very dangerous time for a demon. A Host is a demon's armor in the Material Plane. Demonic weaknesses and sin banes will have a devastating impact while a demon is effectively naked to the environment. Without flesh, many sin powers that require a physical touch or voice to operate will not work without a corporeal form. Fighting a demon’s soul separated from its Host becomes a matter of fighting it on magical means rather than physical. Banishment, imprisonment, and even destruction is not only easier, but do-gooders will be eager to face their foe on this uneven playing field where they have advantage.

After possession has taken hold, the demon will gather enough strength and begin to alter the host's body. This could take days or even months. Eventually, the body might no longer appear as it once did, such as claws or horns, sometimes a tail or tentacles. A demon will twist its form based on its needs or desires for improved functionality. While the original Host was Human, the demon can alter the body's features to resemble someone else entirely. They can even make themselves appear as an elf or drow since their physicality is so similar, though any other race beyond human and elf would require far too much concentration to pull off without relying on external magical assistance to pull off a shape shift or glamour. This is why this shape is called a False Form as it makes it easier for a demon to hide amongst and trick fellow mortals. Once the demon starts to alter the body of its host it becomes much harder to kill. It can alter physical parts of the body until the body becomes almost indestructible. This takes some skill on the part of the demon and a considerable amount of power.


Demonic Personality Traits

There are many universal personality traits that most demons possess to some degree. It is not uncommon to find a demon that is in possession of all of these traits, but one would be hard pressed to find a demon that holds none of them.

Demons have an impulsive nature and a driven need for stimulation. They enjoy living life on the edge and as such verbal outbursts, physical punishments, promiscuity, raping, sexually acting out, gambling, and drug/alcohol use are common. Demons    are abusers and they believe they are all-powerful, all-knowing, entitled to every wish, with no sense of personal boundaries,and no concern for their impact on others.

  • Pretentious: They assume they are important and feel entitled to certain things as it is ‘their right’. They are egotistical to the point of narcissism.
  • Manipulative, Cunning, and Calculating: They selfishly scheme and they do not care for the rights of others. Demons enjoy complex schemes to dominate and humiliate their victims. Demons exercise tyranny control over every aspect of the victim's life, enslaving them.
  • Vengeful: Demon’s are remorselessly vindictive when thwarted or exposed.
  • Superficial Charm: They may seem charming, but they are secretly they are hostile and domineering. Demon’s generally tend to have a fluency of speech or writing that might suggest a true insincerity or lack of concern.
  • Callous and Shallow Emotions: Such emotions of warmth, joy, love, and compassion are often feigned and serves an ulterior motive. They can easily take advantage of a victim’s distress because they are unable to empathize with the pain. A demon’s promises mean nothing as they were never genuine to begin with. Demons can often become outraged by insignificant matters while remaining unmoved by what would normally upset someone.
  • No Conscience: They lack remorse, shame, or guilt. The end justifies the means to a demon. Mortals are seen as nothing more than instruments to be used and targets of opportunity. Friends do not exist, only accomplices that might end up victims.
  • Irresponsible, Unreliable, and Versatile Criminals: Demon’s just don’t care if they destroy someone else’s life and dreams, truly oblivious or indifferent to such devastation. A demon will quickly blame anyone but themselves even for an act they obviously committed. A demon in their false form might even change their image or entire life story readily to avoid prosecution.
  • Pathological Liars: No demon will *ever* reveal all concerning anything and even if they lead someone into believing that they know, the truth is, they only know a shadowy portion. Demons are often extremely convincing, creating complex fabrications.
  • Secretive: A demon’s overall agenda is usually kept to themselves. It is rare for a demon to reveal much about their activities or plans and they tend to keep their real or full names hidden. This secretiveness is a form of keeping control and power to themselves. Knowing the full and true name of a demon is said to give the knower an amount of control over the demon. Knowing the overall plans of a demon gives away their power as well.


Demon Subtypes

Demons feed upon sin. It is the source of their power. Thusly, it is their prerogative to influence those on the Material Plane to sin so that they can reap its benefit. Demon society revolves around the Seven Demon Masters or Lords of Hell and their corresponding Houses. Each Lord is the embodiment of one of the Seven Deadly Sins. A demon chooses ONE Lord to serve and whichever Master a demon pledges fealty to, gains boons and suffer banes related to that Lord’s Sin. Note: Demon Lords are non-playable characters!


  • High Lord: Leviathan, General of Hell’s Armies
  • Favor of Jealousy: The Jealousy demon draws its power from being in proximity (10m) to mortals who are consumed with jealousy, envy, covetousness, and desire for that which they have not.
  • Bane of Jealousy: Repulsed by the willpower of the content at heart, the self-assured, and those who are  comfortable, gratified, and complacent with their life. Those who do not want, and do not covet, have the willpower to drive off the jealousy demon.
  • Spells of Jealousy:
    • Blind Envy Emit an aura that can cause temporary blindness, ranging from being unable to see one’s own possessions to completely blind and length depending on exposure time
    • Schadenfreude Suggestion that influences a target to become focused on and delight in causing harm to others


  • High Lord: Beelzebub, Commander of All Lesser Demons
  • Favor of Gluttony: The Gluttony Demon draws its power from being in proximity (10m) to mortals who consume more food and alcohol than is biologically needed.
  • Bane of Gluttony: Repulsed by the willpower of those who fast, abstain, restrain, and watch their diet.  Those who do not partake in indulgence have a mighty willpower to drive off the Gluttony demon.
  • Spells of Gluttony:
    • Iron Gut High resistance to any adverse digestive issues, such as poison
    • Insidious Indulgence Emit an aura that can cause a target to wastefully indulge in an activity or object


  • High Lord: Mammon, Son of Lucifer and Prince of Hell
  • Favor of Greed: The greed demon draws its power from being within proximity (10m) of mortals who are greedy, miserly, stingy, hoarding, and selfish.
  • Bane of Greed: Repulsed by the willpower of those who are benevolent, generous, philanthropic, altruistic, and charitable. Extremely repulsed by acts of charity or generosity toward them, a simple offer of a free meal would drive a greed demon away.
  • Spells of Greed:
    • Cruel Collection Emit an aura that causes a target to temporarily excessively, hoard an object or person
    • Avarice An ability that, with concentration, is able to cause a target to have a strong desire to steal by looking at them


  • High Lord: Asmodeus, Master of Fleshcraft, Breeder of Monsters for Leviathan's Army
  • Favor of Lust: The Lust demon draws its power from being in proximity (10m) of mortals who are lewd, bawdy, libidinous, immodest, and smutty. 
  • Bane of Lust: Repulsed by the willpower of the chaste, the celibate, the monogamous, and the pure of heart. Children, virgins, monks, and nuns' willpower are extremely effective at driving out lust demons.
  • Spells of Lust:
    • Immoral Scent Magical aroma that acts like a highly potent airborne aphrodisiac
    • Licentious Tongue Magically enhanced voice that can influence a target’s thoughts/feelings


  • High Lord: Lucifer, King of Hell
  • Favor Of Pride: A Pride Demon draws its power from being in proximity (10m) of mortals who are vain, narcissistic, arrogant, and self-absorbed.
  • Bane of Pride: Repulsed by the willpower of the humble and meek, acts of humility, deference, and respect toward them. A pride demon who is given unpretentious treatment from those who are modest of heart will be cast away, repulsed, and driven out from the mortal realm. The pride demon struggles to draw its power around those of common, meager existence.
  • Spells of Pride:
    • Vainglory A magical touch that can temporarily make a target believe they have great physical or social power, with length of touch determining amount.
    • Narcissus’s Reflection Magical ability to make any reflective surface show an image of what a target desires and emit an aura of empowerment.


  • High Lord: Belphegor, Controller of Traffic In and Out of Hell
  • Favor of Sloth: The sloth demon draws its power from being within proximity (10m) of mortals who are lazy, procrastinating, lethargic, and apathetic.
  • Bane of Sloth:  Repulsed by the willpower of those who are industrious, diligent, hard-working, busy, steadfast and persistent. Those of tireless, laborious spirit can drive off a Sloth Demon.
  • Spells of Sloth:
    • Hellish Omission Emit an aura that causes a target to temporarily forget what they were doing and their goals/tasks
    • Cruel Lullaby Suggestion through song or words that lulls a target into laziness or sleep


  • High Lord: Satan, Herald of Hell
  • Favor of Wrath: The wrath demon draws its power from being within proximity (10m) of mortals who are consumed with rage, hatred, and anger.
  • Bane of Wrath: Repulsed by the willpower of those who are peaceful, loving, and especially blood-virgins  (those who have never harmed another). Mellow, neutral, amicable, and tranquil mortals can drive off a  wrath demon.
  • Spells of Wrath:
    • Boiling Blood Emit an aura that, with concentration, can cause a target to temporarily become enraged and erupt in anger
    • Burning Anger A touch that, with concentration, can burn a target with damage increasing with longer contact