A Comprehensive List of Esoteric Classes
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The Foundation's primary directive is to order the chaos of the anomalous by designating each with a four-digit number and a method of containment. One of the tools used to accomplish this is the Object Class, a method of parsing anomalies into groups based on the difficulty of containment. Full dossiers are available for archivists wishing to familiarize themselves.

Despite this, some anomalies warrant entirely new object classes beyond the standard Safe, Euclid, Keter, and sometimes even beyond Thaumiel, Neutralized, and Explained. These Esoteric Classes are extraordinarily rare, and many are not viable for standard documentation due to their unique and specialized nature. The following lists serve as a collection of these highly esoteric classes.

A full list of all documents cataloged under "esoteric-class" is available here.

Established Esoteric Classes

The following classes are considered viable for standard documentation.


Some archivists have determined that the anomalies assigned to them do not totally conform to the standard definitions of Safe, Euclid, or Keter. As such, a subclass system has been created but rarely implemented.

System Classes

The following classes do not describe the anomaly they are assigned, but are rather a placeholder or the result of a system error.

Anomalous Esoteric Classes

The following classes are, generally, the results of infectious memetic agent and infohazards; personnel lacking a Cognitive Resistance Value (CRV) of 16.3 or greater are advised to read at their own risk.

Foreign Esoteric Classes

The Foundation is an international organization which employs researchers and archivists from almost every nation. The following are object classes created by non-English affiliates of the Foundation and initially organized by Researcher ZiakialZiakial.

Theoretical Esoteric Classes

The following classes have not been officially implemented in any form of documentation, but have been tentatively proposed.

This post, created by u/Cooldude97, was incredibly helpful in the compiling of this list. Additional resources include this Amino page by <° ~Die~ °>, this follow-up chart of object classes by u/AntazarOfQwurz, the KaktusKontainer list by YossiLeinerYossiLeiner, SCP ILLUSTRATED’s video on the subject, and this forum post.

If you need any clarifications or have any questions, contact NagirosNagiros over Wikidot.

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