| A | B |
|---|
| Bats | Known as Fliers in the Underland |
| Bats’ Names | All are taken from Greek Mythology |
| Bonding | Ceremony as longtime allies of a particular Human |
| Echolocation | Gives Bats a nearly infallible sense of direction |
| Ares | Bonded to Henry |
| Aurora | A golden bat that was bonded to Luxa |
| Euripides | Bonded to Vikus, gray in color |
| Andromeda | Bonded to Mareth |
| Ajax | Deceased; In life bonded to Solovet |
| Pandora | Deceased; In life bonded to Howard |
| Hermes | Orange-and-black speckled messenger bat |
| Icarus | Deceased; Plague victim; accidentally spread the plague to several people, including Gregor's mother |
| Daedalus | Has creamy white fur |
| Cassiopeia | Plague victim |
| Pollux | Plague victim |
| Nike | A princess of the fliers |
| Thalia | Intended to bond with Hazard (but he died) |
| Queen Athena | Queen of the fliers, mother of Nike |
