Mefisto eggs are said to have come from the darkness itself. The Mefisto eggs are really just a ball of not only anger but also pranks. It is said that once an owner takes the Mefisto egg, all of their past pranks are transferred to the creature inside. So basically the Mefisto knows everything you have ever done. Kind of spooky right?
When hatched, these creatures cause havoc and chaos all throughout the city of Ark. When the Mefisto feels threatened, it will use dark power to curse the human or creature who dares to mess with it. The Mefisto can morph to trick humans and creatures of Ark, playing harmless pranks to those who come across it.
However not everything about the Mefisto is bad. Some of the pranks they play are rather entertaining. There are many famous Mefisto's in Ark's history that are known for the elaborate pranks they have played. Every year around Halloween, all the Mefistos get together to try and pull the biggest prank all year.