Wolf eels are a race of animals living in Hidden Kingdom. No wolf eel has yet been distinguished as a king or queen, nor has any castle of theirs appeared.
The wolf eels at some point made their living in the tunnels where the Sword of Dark Fire was buried. It is unknown if they were stationed there as guards of if they made their living there of there own accord. They menaced HighRoller and Lin Chung when they attempted to reach the sword's chamber in The Sword of Dark Fire.
- Unlike real-world wolf eels, Hidden Kingdom's do not appear to be aquatic.