Feeb- No one knows for sure, Winston is the only known feeb.
Xella- a large flying creature, with a feathered head and wings with a lizard-like body. Not too smart.
Manali- a small bird creature, often kept for a pet. They are hard to digest, if swallowed whole.
Levian- a large scaled sea beast that will devour anything. This creature goes un-named in the series.
Shadow- a ghostly creature, that dissolves in light.It is said they make a wailing cry, however it seems that only those decended of mages can hear them.