Proposed Canon
A type of Dwagon.
Artemis stated that the gas breath weapon of a green dwagon was able to form a combo with the fire breath weapon of a red dwagon. She also mentioned that while the fire breath weapon deals damage, the green dwagon's gas breath weapon has a chance to croak a unit instantly. LIAB Text 52
 First Appearance
The green dwagon breath attack is a gas attack.Erf-b1-p050
A small green dragon appears in the first panel of the first page, just below the words "it's the little things which make a difference sometimes"...