Vamdemon —— 《Digimon》

The king of the immortal Digimon who was once completely wiped out by a powerful and vicious virus. It can revive the data it destroyed and absorbed into a vicious virus to strengthen its own strength. It is also very cruel and cunning and very difficult to eliminate. It can be said to be a living nightmare that can never be shaken off in the Digimon world. However, as its appearance shows, its power can only be exerted at night. Its power weakens during the day, and it usually sleeps in its coffin when it is not active.