Xaerous, also sometimes referred as Zelos (not to be confused with the giant red eyeball of the same name), is the first fortress of the Bacterians. It was powered by the Xaerous Brain.
Xaerous served as the Bacterians' living super fortress during the First and Second Bacterian Wars. In the Second Bacterian War, Xaerous was infiltrated and destroyed by Vic Viper.
- Xaerous appeared in the second episode of the Salamander anime.
Zelos in the Salamander anime