The bog slain is essentially a better version of a zombie. Created by a water mage of little repute (her name is not even remembered today), the only corpses the woman had to work with were ones found in the bog nearby her home. Harvesting the lost bog bodies proved difficult, but did not expose her machinations to the authorities (as would stealing bodies from the local cemetery). The bog slain served the mage for many years before her death at the hands of a rival sorcerer. This man took her notes, copied them, and sold them to all interested parties. This is how bog slain have come to be located in all parts of the world; as wizards similar in situation to the water mage worked to make their own undead servants.