Stake

A stake was commonly believed to be one of the only weapons that could kill a Vampire. (WC: ) Stakes were often made from wood. (PROSE: Iris Wildthyme and the Unholy Ghost)

History
When the verger wielded a mallet and a wooden stake, he thought of himself like Van Helsing. (PROSE: Iris Wildthyme and the Unholy Ghost)

In River Song's diary, it was noted that it was common belief that stakes could kill Vampires, but she also noted that various myths had become confused. (WC: )

Other uses
The Head was quite literally a head on a stake. (AUDIO: Wildthyme at Large)