Vampire Bats

Vampire Bats live in Central and South America. Three of these bat species feed solely on blood: the common vampire bat, the hairy-legged vampire bat, and the white-winged vampire bat. These species are the only mammals that feed exclusively on blood.
They have a high level of resistance to blood-borne viruses and use infrared radiation to locate blood hotspots on their prey.
In our game, they have the advantage of looking at the top 3 cards of the Host deck and placing any or all of them on the top or bottom of the deck, representing these animals’ incredible locating abilities.
Leeches

Leeches are parasitic or predatory worms that are closely related to earthworms, one of the main differences being that they have suckers at both ends. They attach themselves to a host with one of these suckers and feed on the host’s blood, after secreting a peptide to prevent blood clotting.
In our game, the leech has the ability to add 1 blood to their Host’s blood pool, representing their insatiable hunger and ability to thoroughly suck their’s host’s blood.