Blood was originally spawned from a joint venture between 3D Realms and Monolith Productions until the latter took over in January 1997. Based on 3D Realms' Build engine, the game thrusted players into the role of Caleb, a former supreme commander of a cult called “The Cabal,” brought back from the dead. Bitter and out for blood, the tools of his vengeance against the ancient, forgotten god Tchernobog and its minions were deliciously sinister, consisting of voodoo dolls, firearms, and magical weapons. Blood spawned only one sequel, Blood II: The Chosen.

On a side note, South Korean manhwa artist Hyung Min-woo claims that Blood was the inspiration behind his popular manga/comic, Priest. Both feature an undead protagonist in a horror-Western setting.