A Comprehensive List of Esoteric Classes
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 exceedingly 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.
Several of the following classes are self-explanatory in nature; a definition of "Uncontained" will not be included, nor will a differentiation between "Debated" and "Currently debated". If an archivist creates a new esoteric class, they are free to update the list to reflect this in the following format.
||● Class||Definition (if necessary)||[[[SCP]]]||
If a definition or SCP is being added, follow the below formatting.
The ● serves to indicate the addition has not been verified. It will be manually removed to signify the attached class is valid. Please do not verify additions.
Established Esoteric Classes
The following classes are considered viable for standard documentation.
| Class |
Definition |
Appearances |
| Apollyon |
Item is uncontainable and actively causing the end of the world. |
Jim North's Proposal, SCP-3999, SCP-4005, SCP-4023, SCP-4057, S. D. Locke's Proposal |
| Archon |
Item is able to be contained but ought not to be. |
I.H.Pickman's Proposal, SCP-1661, SCP-3310, SCP-3455, SCP-3787, SCP-4043, SCP-4043, SCP-4200, SCP-4494 |
| Declassified |
Item has been revealed to the general public. |
SCP-3368, SCP-3882 |
| Embla |
Item is used by the Foundation to create anomalies. |
Dr. Mann's Proposal |
| Eparch |
Item is non-anomalous but related to the anomalous. |
SCP-4015 |
| Esoteric |
|
SCP-4467 |
| Gevurah |
Item endangers the inner structure of the Foundation and limits the ability of the Foundation to carry out its secondary objectives. |
SCP-3666 |
| Gödel |
Item is explainable using anomalous technology. |
SCP-4555 |
| Hera |
Item is hostile but very useful to the Foundation. |
SCP-4113 |
| Hiemal |
Item is used to keep other Hiemal-class items in check. Meta-discussion logged here. |
SCP-3240, SCP-3700, SCP-4121, SCP-4540 |
| Humanoid |
|
Djoric-Dmatix Proposal |
| Ignosi |
Item's discovery, even by the Foundation, must be prevented. |
Automated Passive Amnestization System Ver. 17.09 |
| Kušum |
Item's containment has been abandoned indefinitely. |
SCP-3319 |
| Maksur |
Item has been separated into several anomalous parts which must be kept apart. |
TwistedGears-Kaktus Proposal |
| N/A |
|
SCP-3252, SCP-3443, SCP-3930, SCP-4104 |
| Netzach |
Item is Earth and its ability to support life. |
Billith's Proposal |
| Non-Anomalous |
|
WJS Proposal |
| None |
|
SCP-048, SCP-1763-EX, SCP-2165, SCP-2508 |
| Principalis |
Item is a direct threat to the Overseer Council. |
djkaktus's Proposal III |
| Tiamat |
Item poses an immediate threat to humanity, but some hypothetical procedures may stop it. |
SCP-3396, SCP-3895 |
| Ticonderoga |
Item cannot be contained but does not need to be contained. |
SCP-4444 |
| Uncontained |
|
SCP-3005, SCP-3681, SCP-4911 |
| Unknown |
|
SCP-3005 |
| Unnecessary |
|
Lily's Proposal, SCP-4023 |
| Yesod |
Item is the anomaly which serves as the literal foundation of Foundation operations. |
spikebrennan's proposal |
| Zeno |
Item has medium containment difficulty and is low threat. |
SCP-2005 |
Subclasses
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.
Question: What's the reason for the Latin?
Answer: The reason is "because I can get away with it and want to encourage people to experiment with Object Classes as they see fit, without discouraging people from continuing to use the standard object classes". And it is something new.
Question: Are these subclasses leading up to anything?
Answer: They lead up to me poking at people's irrational attachment to this arbitrary classification system. I care far more about discussion posts than rating, so if I don't feel that some part of a piece has any real connection to literary merit, I'll just do whatever gets people to make posts about it, even if it's not people's favorite thing.
So far, it's worked brilliantly :^)
- 
Communism will win
Safe-Class
| Class |
Definition |
Appearances |
| Safe-doctrina |
Item is Safe-class and undergoing testing or investigation. |
SCP-1306 |
| Safe-exsequi |
Item is Safe-class and capable of independent action. |
SCP-1268, SCP-1646, SCP-1868 |
| Safe-impetus |
Item is Safe-class and hostile. |
SCP-619, SCP-984, SCP-1626 |
| Safe-nuntii |
Item is Safe-class and possesses memetic attributes. |
SCP-1248 |
| Safe-praedico |
Item is Safe-class and possesses clairvoyant attributes. |
SCP-1668 |
| Safe-prodest |
Item is Safe-class and possesses useful attributes. |
SCP-066 |
| Safe-reliquia |
Item is Safe-class and is an artifact or relic. |
SCP-1962 |
Euclid-Class
| Class |
Definition |
Appearances |
| Euclid-alterius |
Item is Euclid-class and is alien to Earth. |
SCP-824, SCP-1041 |
| Euclid-exsequi |
Item is Euclid-class and capable of independent action. |
SCP-928, SCP-1606, SCP-1846, SCP-2020 |
| Euclid-flecto |
|
SCP-625 |
| Euclid-impetus |
Item is Euclid-class and hostile. |
SCP-066 |
| Euclid-nuntii |
Item is Euclid-class and possesses memetic attributes. |
SCP-868, SCP-1246, SCP-1448 |
| Euclid-numen |
Item is Euclid-class and related to a deity. |
SCP-1564, SCP-1704, SCP-1902 |
| Euclid-ubique |
Item is Euclid-class and has wide-ranging effects, geographically. |
SCP-5280-J |
Keter-Class
| Class |
Definition |
Appearances |
| Keter-alterius |
Item is Keter-class and is alien to Earth. |
SCP-1141 |
| Keter-potissimi |
Item is Keter-class and its containment is of high importance. |
SCP-2959 |
| Keter-provisi |
Item is provisionally assigned Keter-class until deemed otherwise. |
SCP-2721 |
Additional Subclasses
The following subclasses are used in conjunction with standard classes, e.g. "Euclid // Location".
| Class |
Definition |
Appearances |
| Location |
Item requires containment to be built around it. |
|
| Object |
Item does not need containment built around its position and does not have containment procedures which are reactionary. |
SCP-2156 |
| Phenomenon |
Item has containment procedures which are reactionary in nature. |
SCP-1422 |
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.
| Class |
Definition |
Appearances |
|
Object class has been omitted from documentation. |
Di Molte Voci, Dr Gears' Proposal, Dr Weppler's Personnel File, EE-3570, SCP-1654, SCP-3682, SCP-4100, SCP-4311, URA-9611 |
| [DATA EXPUNGED] |
|
Pedantique's Proposal |
| Debated |
|
SCP-4096, SCP-4977 |
| HANDLE_NOT_FOUND |
Item's class is unable to be located. |
SCP-2718 |
| In doubt |
|
SCP-2685 |
| Other |
|
SCP-2505 |
| Pending |
|
SCP-2827, SCP-3030, SCP-3557, SCP-4008, SCP-4013, SCP-4511 |
| [REDACTED] |
|
SCP-1463 |
| UNDEFINED |
|
UNDEFINED |
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 
Ziakial.
If a foreign esoteric class falls into any of the following categories, it should not be included.
- Object class is the result of third-party manipulation, anomalous or otherwise.
- Object class is the extension of a previously-existing class, such as SCP-CN-266's "Extreme Keter" class.
- Object class is a subclass of a previously-existing class; add this to the Subclasses section.
Theoretical Esoteric Classes
The following classes have not been officially implemented in any form of documentation, but have been tentatively proposed.
| Class |
Definition |
| Anatta |
Item is capable of causing a YK-End-of-the-Universe Scenario, or altering the universe in a detrimental manner. |
| Mild |
Item is almost completely safe to interact with unless handled in an irresponsible manner. |
| Truculent |
Item is dangerous and unpredictable. |
| Simpatico |
Item is unpredictable but not dangerous. |
| Yggdrasil |
Item is capable of causing a ZK-End-of-Reality Scenario, or altering reality in a detrimental manner. |
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 
YossiLeiner, SCP ILLUSTRATED’s video on the subject, and this forum post.
If you need any clarifications or have any questions, contact 
Nagiros over Wikidot.
