They fly and glide,
and sweep down below.
their sweet tooth calls,
for yer bone's marrow.
No bigger than an ordinary house cat, Bloodpackers are a variation of the demon sub-species known as Nihilin, entities created from the negative energy absorbed by an unknown life-giving power. They belongs to a more common set of their species, as they the easiest to spot or encounter, though in contrast to majority of the Nihilin kind, Bloodpackers are not as aggressive and sentiently homicidal; the creatures are more likely to fly away unless their territory or their pack is threatened, and if so they will attack in swarms once they're in full rage, in self-defense.
Due to their more naturally animalistic nature, Bloodpackers are also the easiest Nihilins to control. Black spell users can easily control a large number of these creatures into doing their biding, putting a great deal of advantage to their part. However, while basically immortal, these creatures are more prone to physical damage than their larger species, making them not as useful when used for raiding towns or cities.
Basic magical trinkets seems to repel them easily, as to the smell of garlic and other spices. Silver weapons are also effective weapons against them.