Couatl are a race of brightly feathered serpents with wings. They are rarely encountered and if so, would be in a remote tropical environment. They are often treated as gods by those who serve them, however couatl rarely meddle in human events.

They can polymorph themselves, turn æthereal, and cast magic. Most are equal to a 5th level mage (45%), but a few are 7th level clerics (35%). There are a handful of couatl (20%) who cast as a magic user/cleric. In combat a couatl attacks with its bite that causes 1d3 damage and the victim must save vs poison or die. A couatl can also constrict with its body. A successful attack means the beast has grabbed its victim causing 2d4 damage, with an additional 2d4 damage each round until one or the other is dead.