Yggdrasimon is a Program Digimon whose name is derived from the mythological Yggdrasil and the Digital World Creator Yggdrasil. It is a Digimon who was created when Yggdrasil was infected with its own X-Program by its followers and was later infected with the X-Antibody to create a Mirage Digimon incarnated as Yggdrasimon, a Digimon which received a fraction of Yggdrasils intelligence and power, so it is sometimes called "The Digital Minor". It has a good personality and carries a low-strength X-Program as well as X-Antibody in its back. It has no mercy on bad Digimon and helps its allies always when possible. It cannot be deleted into a DigiEgg, but can be degenerated when weak enough.
Yggdrasil: Origins of the Program