Vampires are former humans who have been killed and then resurrected into undead form. They subsist by feeding on the life essence (in the form of blood) of living creatures. Although compared to normal humans, vampires are powerful immortal creatures, they tend to form organizations to defend themselves against those who hunt them, such as mages, werewolves, and even packs of humans. The only existing organization remaining is the Sabbat, but previously there existed the Kingdom of Enoch, the Camarilla, and all their individual vampire clans. Formal government programs designed to hunt vampires are known as Crusader Teams.