Flying golden deer with fangs, sharp hooves and poisonous antlers. The team are accosted by a herd of perytons fleeing a dragon. One gores Warren which seriously injures him.
In book 2, Vanessa explains to Seth through Coulter, that she believes the cursed being in the grove guarding the secret artifact is a phantom. Grandpa Sorenson mentions in Book 4 that they're keeping a phantom prisoner in the dungeon.
Pixies are a type of fairy that are briefly mentioned in the first book. In book 2 Coulter describes a type of Pixie that lives in Norway that shed their wings at the onset of winter. They make a cocoon to protect them and emerge from them in the spring with a new set of wings. It's these cocoons that Coulter explains to Kendra and Seth that can envelope a person in an impervious shell. It is this shell that eventually saves Seth from being devoured by the glutton.
A Revenant is essentially a Zombie, or a reanimated corpse. The Revenant in book 2 was a guard over the vault where the magical artifact was hidden. He radiated powerful magical fear and turned victims albino, mute, and catatonic. Warren was introduced like this, though his condition was a mystery at the time. The Revenant was defeated when Seth pulled the cursed nail from its neck after downing some pure liquid courage he took from Tanu.
Satyrs are part goat, part human creatures. They live fun and frivolous lives. Two Satyrs, Newel and Doren, play significant rolls in Fablehaven. They make parties more exciting, play tennis, and trade gold to Seth for batteries to power their portable TV. Kendra and Seth are introduced to Verl in book 3, who Seth figures out was the satyr equivalent of a nerd. Rondus is the name of another satyr during the game of tackle tag.
Humans that have the ability to shape shift into an animal. Comparable to an Animagus in the Harry Potter series. At Lost Mesa preserve, Neil revealed himself as a skinwalker and turned into a stallion to save Kendra's and others lives.
Sky Giant
The team sent to retrieve the artifact key at the Dragon Sanctuary is captured by a Sky Giant named Thronis. He enjoys a civil and proud existence and is described as the largest giant in the world, several times larger than Fog Giants. He is cordial to the team of adventurers, though he does still threaten to make a pie out of them.
Snow Giant
Thronis, the sky giant, obtains a magical figurine that when buried in the snow, and certain magic words are spoken, will become an actual snow giant and useful servant.
Related to Fairies. Vanessa tells Kendra of the Umite Sprites that dwell in hive-like communities in rain forests around the world. They make honey and wax like bees. The candle and crayon Vanessa gives Kendra is made of Umite wax.
Stingbulb
These creatures actually start out as a fruit growing on a Stingbulb tree. The tree only produces a few a year. When touched, they obtain a tissue or blood sample - which is where the sting comes from. Then it takes them about 90 minutes to grow into a replica of that person. This copy only lives for 3 to 4 days after completing the metamorphosis. It keeps much of the memories of the person it is impersonating. It obeys its initial instructions to perform some mission before it dies. In book 4, Kendra is kidnapped and replaced by a stingbulb impostor who attempts to pass secrets to the Society of the Evening Star. She creates another stingbulb to escape, who currently resides in the quiet box so she can live longer and be useful for other purposes.
Found in the bogs and swamps of Fablehaven, swamp hags some times create false paths to lure travelers toward them. A swamp hag is mentioned to have trained Muriel.
