Lurking beneath the waves, Umbralia hunt at night, looking to strangle the lifeforce out of unsuspecting humans and Enigmon. They're devious and mean-spirited, hating on other, more popular Enigmon and ultimately dragging them underneath the water purely for their own twisted sense of enjoyment. On rare occasions, they may befriend humans, but will immediately become hostile and possessive of their new friend if anyone tries to draw their attention away from Umbralia itself. This has resulted in numerous missing cases reports, all linked back to wild Umbralia who kidnapped them.