Ορός της Μνήμης

The Memory Serum is a drug used to erase the memories of a particular individual or group. It was designed by the Bureau of Genetic Welfare for use in their long-term genetic experiments.

Allegiant

Shortly after arriving at the Bureau of Genetic Welfare, Tris Prior discovers that the Memory Serum was one of multiple serums entrusted to the five factions of the city, the Memory Serum had been given to the officials of Abnegation. It is revealed that David, the head of the Bureau, uses the stores of serum at his disposal to 'reset' experiment cities that had gotten out of hand, without having to shut them down. Tris disagrees with the use of the serum to 'reset' cities, as she believes it is unethical and unfair to strip people of their identities and relationships.