Trolls are unfriendly creatures that live in the forest, in caves or underground. Nero is a lizard-like cliff troll with a huge hoard of treasures. With the use of a seeing stone, which is a piece of gold that has an N on it, he helps to locate Grandpa Sorenson after he was kidnapped. Seth befriends a mountain troll named Nero who helps him obtain the unicorn horn, or "Soul of Grunhold". A Hermit Troll, Bubda, ends up accompanying the team searching for the key at Wyrmroost.
White horses with spiraling horns on their foreheads. Unicorns are exceptionally rare and some considered them extinct. They represent purity, and their horns purify. Though not seen in any book this far, in Secrets of the Dragon Sanctuary a unicorn horn must be obtained from the centaurs of Grunhold in order to open the gates of Wyrmroost.
Werebear
A man who can transform into a bear-like beast. A werebear helps the Sphinx escape at the end of Grip of the Shadow Plague.
These are mortal females who have turned to evil and dark magic. Muriel, the witch was responsible for freeing the demon Bahumat, and was imprisoned with him at the end of book 1.
Men with powerful magical abilities. In book 3 a fellow Knight of the Dawn tells Kendra of a Warlock who has the ability to create dullions. Further in the book, Warren explains to Kendra that powerful wizards used to be the only ones who could successfully contend with dragons. Agad, in book 4 reveals himself to Kendra as a wizard, and explains that all wizards were dragons who have chosen to permanently remain in their human forms. Archadius was the first wizard who discovered that his magical abilities were greatly focused as a human.
Wizard's Slime
An orange creature resembling living pudding. Effective in extracting poison from infected tissue.
- Ghosts or other apparitions. In book 4 Grandpa Sorenson discusses with Seth the wraiths imprisoned in the Hall of Dread. He also threatens the Maddox imposter with a close encounter with a wraith.
Corpses that have been re-animated. In book 3, Grip of the Shadow Plague, Hal introduces Kendra and Gavin to a graveyard full of buried zombies. He feeds them through tubes in the ground to keep them from eating people. Later, the zombies are released by Gavin (who, in book 4, Secrets of the Dragon Sanctuary, is revealed to be the evil dragon Navarog) and assist in the destruction of the preserve Lost Mesa.
