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Demons are inter-dimensional beings who travel from world to world and destroy everything in their path. They return to their dimension when they die. Religiously, they are defined as hell's denizens, the servants of Satan, but for the purposes of the Clave, they are any malevolent spirit whose origin is outside of the home dimension. There are many different kinds of demons. Many demons are poisonous and the Nephilim healing rune (the iratze) is ineffective against it.
Greater Demons are an extension of Demons and are far more powerful. They must be killed both in their physical and ethereal forms to be forced away from the home dimension. Sunlight and seraph blades are fatal to both Demons and Greater Demons. Greater Deamons, like all demons, never truly die. When they are killed, they are not simply sent back home, they are scattered in between worlds. It will take a long time for them to re-form and they will be weak for years to come.
When demons die they tend to fold into themselves and vanish, generally with a shriek. Some Demons leave things behind when they die (ash, dust, fluid, etc.).
Greater Demons:
â– Abbadon, Demon of the Abyss (Greater Demon) - Its flesh is livid and bruised looking. Through the seeping skin bones protrude - not new white bones, but bones that look as if they had been on this earth for a thousand years, black, cracked and filthy. Its fingers are stripped and skeletal, its thin-fleshed arms pocked with dripping black sores through which more yellowing bone is visible. It has taloned fingers and is at least 9 feet tall. It has empty eye sockets, smells bad and has 2 rows of jagged glass-sharp teeth. Its hide is grey with things seemingly crawling inside of it. He's faster than Shadowhunters. It has hands and a misshapen head.
â– Agramon, Demon of Fear (Greater Demon) - Shapeshifts into a person's greatest fear and literally scares its victims to death. When "formless", he is a black cloud with glowing eyes, a malformed, enormous, hideous shape with eyes the size of saucers.
â– Lilith, the Mother of Demons - The first woman to be created. She would not stay obedient and left Adam. She was later cursed to have all children she produced die. Mentioned to be a Greater Demon due to her excessive age, possibly being the Progenitor Demon, She possesses other worldly powers and is impossible to kill. She is later "killed" by Simon's mark of Cain when he saves Clary from taking a lethal blow. Greater Demons can't be killed, but what Simon's Mark of Cain did was scatter her between worlds. It will take a long time for her to re-form and she will be weak for years.
â– Marax - encountered by Charlotte when she was a girl. A barrister had summoned the demon, which had subsequently slaughtered him and his family.
â– Yanluo - the demon that killed Jem Carstairs' parents and tortured him with demon poison, which he afterwards became addicted to.
â– Azazel - is a Greater Demon, and a Prince of Hell second only to Lucifer. He is a Lieutenant of Hell and Forger of Weapons. He was an angel who taught mankind how to make weapons, which is what caused him to fall. The whole earth has been corrupted by the works that were taught by him. He is bound to the jagged rocks of Duduael. If you summon him, his spirit form will come to you but his corporeal self will remain bound.
Lesser Demons:
â– Ahiab Demon - A massive scaled demon with a thick, lizard-like body. It's blind and has a keen sense of smell. A thick line of serrated teeth run along its forehead where eyes should be. It has another mouth on the lower half of its face as well, fanged with dripping tusks. It has a narrow tail that glitters as it moves due to it being edged with razor-sharp lines of bone. It has talons and a long, forked tongue with a bulb at the end of it like a scorpion's stinger. It rapes his victims before killing them.
â– Behemoth Demon - It is formless, huge and slimy. A double row of teeth runs along the length of its oblong body. It slithers with an oozing, boneless motion. It eats anything and everything - people included. It can teleport and its mucus turns seraph blades ineffective. It is semi-corporal and very hard to kill. It can heal its wounds but it seeps its energy - the best way to kill it is to keep wounding it until it can no longer heal itself. Clarissa Fray describes it as "a blind slug with teeth". It creates low noises like angry insectile chittering when angered and when it is killed it leaves behind a puddle of steaming green fluid.
â– Croucher Demon - Its poison is not life-endangering.
â– Drevak Demon - It is blind and tracks by smell. They smell rotten, like garbage and are incredibly fast. This demon is not a fighter. It is mainly used as a spy or a messenger (implying it is capable of human speech). It does not suck its victim's blood. Drevak demons don't have teeth, they have poisonous black spines in their mouths. Drevak poison is incredibly painful and poisonous and should be dealt with by a warlock. A Devrak attack is called a "Devrak sting".
â– Eidolon Demon - it has the ability to shape-shift.
â– Hydra Demon - Has several heads, hard to kill and usually used a sort of guard dog.
â– Iblis Demon - Human-shaped but formed of a substance like coiling black smoke and a pair of burning yellow eyes. It likes to surround its prey but is not very bright. It bursts into ash when it dies.
â– Kuri Demon - Slinking and black.
â– Moloch Demon - likes to fight in groups. It has claws and jets flame from its empty eyes.
â– Oni Demon - has a green body, wide mouth, and horns (sharp tusks sprouting from its forehead). It has legs like tree branches and spade-like hands. It is smart.
â– Raum Demon - Dead white with scaled skin, a black hole for a mouth, bulging toad-like eyes, and arms that end in tentacles where hands should be. The tentacles are grey-white and tipped with blood-red suckers. Inside each sucker is a cluster of needle-sharp teeth. It has black blood and is poisonous. It is more dangerous than a Devrak demon and is incredibly fast.
â– Ravener Demon - A long, scaled demon with a cluster of eyes set dead center in the front of its domed skull. It is something like a cross between an Alligator and a centipede with a thick flat snout and a barbed tail that whips from side to side. It has multiple legs and claws as well as a row of fanged teeth. He drools green fluid and is extremely slimy and poisonous. It can hang off of walls and has a long black tongue.
â– Scorprios Demon - has a wrinkled face, the agile hands of a huge monkey but the long, barbed tail of a scorpion. Its eyes are rolling and yellow and it has teeth like broken needles. It hisses. It is incredibly fast and very poisonous. It uses its scorpion-like tail as a weapon.
â– Shax Demon - has pincers and an insect-like carapce. They are brood parasites, who bring their victims back to their lairs in order to lay eggs in them while they are still alive. They also have a sharp sense of smell, and can be used for tracking.
â– Spider Demon - has eight pincer-tipped arms and poison-dripping fangs that protrude from its eye sockets. It sprays acidic poison.
Information was found on the Shadowhunter's Wiki.