The Dark Virus is The Lost Gem Item but it does not have put back as a kid age but it cause an Normal Animal or a Dinosaur to Become a virus digimon. it awere that it holds dark power inside. it sends out virus digimon: 

Darkugamon Virus Bug

Virus Dinosaur


Virus Animal

MirageGaogamonRM Ruins Mode Virus
LasomonVM Virus Mode

Dark Insect

VennomVimon Dark Viper
DarkGuilmon infected Guilmon
SkullDrigomon dark champion Reptile Digimon
Hydramon Mega Level, Virus Attributed Digimon

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