One of the most powerful magical creatures, demons are often the villains in The Fablehaven series. Several demons are mentioned in the series. They are:
Bahumat - From book 1. A monster that stands three times as tall as a man, with the head of a dragon crowned with three horns. He has three arms, three legs and three tails. He has oily black scales with bristly spikes. He is able to emit a wave of darkness to blind his foes, and has a deafening roar.
Graulas - An ancient demon who was once one of the most feared demons in the world, but is now long past his prime. He basically made Fablehaven his home to await death. He radiates magical fear, and has the ability to see almost anything on the preserve. In book 3 and 4 he aids Seth in overcoming the Shadow Plague, and officially makes him a shadow charmer.
Gorgrog - The king of Demons, responsible for the downfall of the Fairy King. Only mentioned in the fourth book. Suspected to have aided the Sphinx in escaping the Oculus.
Kurisock - A demon more of shadow than substance, perhaps the least is known of him, other than being confined to his lair, which is a cursed tar pit far inside Fablehaven. To interact with the material world, he binds himself to a host, giving the host greater power. He bound himself to the hamadryad Ephira, therefore turning her into a monster.
Lycerna - A gargantuan serpentine demon who has taken over a secret preserve in Brazil.
Olloch - Also known as Olloch the Glutton, is a frog-like monster with several flailing tongues and an insatiable appetite. He is under a spell which keeps him trapped as a tiny statue. If someone makes the mistake of feeding the dormant statue, Olloch will bite the feeder and eventually devour them, thus turning him into a statue again. As he eats, he grows in size and power. In Rise of the Evening Star he grows in size to "much bigger than the elephants Seth had seen at the zoo".
Large, powerful and intelligent winged reptiles. Warren explains that they are the ultimate predator. Most humans freeze in body and mind from a paralyzing terror in their presence, similar to the effects of being near a revenant. Several dragons are identified in the series.
Camarat was one of the sentries to visitors seeking entrance to Wyrmroost. He is red and gold, long and snakelike with 8 sets of legs, the head and mane like a lion. His breath weapon was a sort of truth serum. He allowed the team to pass through to Blackwell Keep.
Celebrant - Widely accepted as the king of dragons. He is the father of Raxtus and resides at the top of Moonfang, the highest peak at Wyrmroost. Raxtus says that he is the biggest dragon in existence, with 5 breath weapons and tons of offensive spells. He is only mentioned in the fourth book, but never seen. Thronis, the sky giant, says that Celebrant is the only dragon on the sanctuary he fears
Chalize was guarding the artifact room at Lost Mesa in Grip of the Shadow Plague. She was a young dragon, not more than 100 years old, more metallic than usual, with copper alloy scales.
Glommus - An old, gray, blind dragon who attempts to destroy the party as they infiltrate the Dragon Temple with a powerful sleep-inducing breath. He was killed by Vanessa, who was currently inhabiting the body of Tanu.
Nafia - An enormous green female dragon who confronts Kendra and Seth. They are saved by Gavin who convinces Nafia to spare them. She appears to the team later in human form calling herself "Nyssa" offering assistance, but they decline her help. Agad reveals that she is the mother of Chalize. She had met Navarog centuries before the book.
Navarog - It is discovered that the captive released from the Quiet Box was this dragon in his human form, also known as the Demon Prince and lord among the dark dragons. An enormous dragon, covered in oily black scales and spikes, belched fire like liquid gold.
Ranticus preceded Chalize as the artifact guardian at Lost Mesa. He was known as one of the most powerful dragons in his time. He was killed by Patton Burgess early in the 1900's. His bones were put on display at the Lost Mesa Museum.
Raxtus introduces himself as a fairy dragon to Kendra. He is much smaller than average, with gleaming silvery white scales. His "human" form is that of a foot-high male fairy with butterfly wings. He was raised by fairies, namely Shiara who currently resides at Fablehaven. He can turn invisible at will, and is an excellent flier. Unlike most dragons, he is shy and has low self esteem, but quickly befriends Kendra, but only after she is alone. Kendra's touch transfers magical energy to Raxtus. He helps her to the fairy shrine at Wyrmroost. His breath helps things grow, and he likes drive in movies.
Siletta is the last obstacle to the Dragon Temple treasury. She resembles a giant salamander with at least 10 sets of legs, and is poison to the core. She has translucent skin, revealing veins and her colorful organs. Her breath poisons intruders, killing them quickly. Some have debated whether she ranks just below Celebrant in dangerous abilities, and could kill Thronis.
Drumants
Furry little creatures that resembles tarantulas with tails. They hop around and can distort light around them, making them difficult to catch. They are nocturnal, and their bites inflict a deadly poison. The drumants in Vanessa's collection still bite, but she bred them not to be poisonous.
Wood Nymphs, who live in the forest and dress in flowing autumnal robes. They are beings of the forest as a whole, as opposed to hamadryads, who are linked to individual tress. Dryads are seen for the first time in book 3 and are described as nimble, very tall (7 feet and up) and can run swiftly through the trees. They, including Lizette, and Rhea, helped in the battle between light and dark creatures.
Dullion
A cruder form of their cousin the golem, made of less quality materials, and have no will of their own. They are usually made of natural materials and animated by a powerful spell. The only known one is made of hay and in the hands of the Society of the Evening Star. It is possible that Mendigo, a human sized, animated wooden puppet, might be considered a Dullion.
Short people who live underground and keep to themselves. Both the males and females have facial hair. These stalky little people first appear in book 3 - Grip of the Shadow Plague, where they fled to the pond to avoid the plague. Some of them, wielding large hammers, also fight in the battle between light and dark creatures. A dark hooded dwarf is one of the creatures guarding the artifact in the inverted tower, but he does not make a physical appearance. In book 4 a dwarf named Zogo introduced himself as the Giant's Dwarf. He rode a griffin, and with other griffins took the team to Thronis the sky giant.
These magical creatures resemble tiny females with wings. They emit a gleaming light, and love their own reflection. The fairies are the first magical creatures Kendra and Seth see on the preserve, and are part of the whole story of Fablehaven more than any other magical creature. The Fairy Queen has a shrine on an island in the preserve, and makes Kendra fairykind, and one of her handmaidens. With instructions from the Fairy Queen, Kendra makes a potion that enlarges the fairies to human size. In their empowered state the fairies defeat Muriel the witch, and the demon Bahumat. In the second book, a fairy named Shiara turns Mendigo to Kendra's will. Other names of fairies include Yolie and Larina. Some of the varieties of fairy identified in the books are:
Downy Fountain Sprite - Blue fuzzy fairies from the island of Roti
Banda Sea Sunwings - Fairies with colorful, stained glass butterfly wings
Jinn Harp - A rare and beautiful fairy, Jinn Harps have an amazing singing voice that mesmerizes all who hear it.
Nightgrifts - Albino fairies from Borneo with black speckled moth wings.
Fire breathing dragons that inhabit the Dragon Sanctuary, Wyrmroost, as listed by Agad, the caretaker.
Fog Giants
A type of giant that lives in the swampy areas of Fablehaven. They are described as powerful, brutal and blood thirsty, but also slightly dim-witted and slow. They are also highly territorial, and fiercely defend their borders. A Fog Giant named Burlox gave Coulter some vital information about where Warren had been before he became a catatonic albino, which led them to the location of the hidden artifact in Rise of the Evening Star.