Vamdemon

Myotismon is an Undead Digimon whose Japanese name and design are derived from the mythological Vampire and Demon and whose English name is derived from the Greater mouseeared bat. As the king of Undead Digimon it was resurrected through the dark arts and obtained mighty powers. Originally a brutal computer virus which destroyed the computer data it absorbed it possessed the ability to revive the destroyed data as malignant computer viruses. As the owner of an extremely cruel and cunning personality it is exceedingly difficult to destroy this Digimon. However it cannot demonstrate its powers outside of the night and its power is cut in half during the daytime.