Murmukusmon (Frontier)

Murmuxmon was an evil Digimon who was banished on the Floating Island. It was there, he learned about Onismon and started the war between the Human Digimon (As D'Arcmon) and the Beast Digimon (As HippoGryphomon) for the purpose of extracting enough data (in the form of digi eggs) to revive the ancient monster and conquer the Digital World to have his revenge. He was ultimately destroyed by Agunimon.

Attacks
 * Gehenna Flame
 * Necro Interrogation

Disguises
Murmuxmon also has the power to transform into any Digimon he wants to be.

D'Arcmon
d'Arcmon was the leader of the Human-type Digimon (made up of Kotemon, Dinohyumon, some Yasyamon, Pucchiemon, Nohemon, and FlameWizardmon) on the Wandering Island. She preached a message of peace, decrying the violent actions of the war but as things escalated, she urged her followers to fight in the name of peace, although she was nowhere to be seen in the ensuing battle. The reasons behind her contradictory actions soon became clear when the DigiDestined followed her and discovered that she and the leader of the Beast-types, HippoGryphomon, were the same being and with her deception revealed to both sides, d'Arcmon revealed her true identity to be the villainous Murmuxmon. This digimon in named after the famous French liberateress, Joan of Arc.
 * Voiced by Tara Platt (US) and Takako Uehara (Japan).

HippoGryphomon
HippoGryphomon was the leader of the Beast-type Digimon (made up of Bearmon, Grizzlymon, Oryxmon, Rabbitmon, Boarmon, Bullmon, Prairiemon, and Moosemon) on the Wandering Island. He preached a message of peace with emotion. The reasons behind his contradictory actions soon became clear when the DigiDestined discovered that he and the leader of the Human-types, d'Arcmon, were the same being, and, with her/his deception revealed to both sides, HippoGryphomon turned into d'Arcmon then revealed her/his true identify to be the villainous Murmuxmon.
 * Voiced by Wally Wingert (English) and Hikaru Midorikawa (Japan).