Earthquacks

Earthquacks are monstrous flightless birds that burrow through soil. They look a lot like petrified or mud covered ducks. Their most notable feature is that they breathe fire.
  The Earthquacks were made by Jokecoat who wanted to make a mockery of the elementals. Air and water combined was a duck, so Jokecoat turned it into an earth burrowing fire breather. Pyurethoniam initially liked the joke but eventually sent Patheothul to destroy them. Jokecoat then decided to place them on the Challenge World cause Patheothul can't directly destroy them there. Pyurethoniam and Patheothul decided not to feed into his jokes anymore and let it rest.
  Earthquacks don't reproduce, they are made by Jokecoat when he thinks they add some necessary comic relief to the situation.