This egg was only available in Egg Cave's Cash Shop Park for April 2012.
Abrillion eggs are very peculiar eggs. No matter how optimal the conditions are for hatching, Abrillion eggs will only hatch on Easter Day.
Not only do Abrillion eggs only hatch on Easter, Abrillions can only be seen flying through the skies of Ark on Easter too. It is rumored that there is some ancient, spiritual connection between Abrillions and Easter. Some say that they are a sign of resurrection and new life.