In the collaborative universe of the SCP Foundation Wiki, an object class isn't a power scale—it's a measure of how hard an anomaly is to keep locked down. New readers often mistake a high classification for raw destructive force, but in reality, a harmless object can be classified as Keter simply because it defies reliable control. Understanding these labels helps you navigate thousands of community-written files without getting lost in specialized terminology.
The classification system governs research priority, resource allocation, and safety budgeting across fictional sites. When researchers draft new anomalies, they rely on standard tiers—Safe, Euclid, and Keter—alongside specialized secondary or esoteric tags. Grasping how these tiers function unlocks the core logic behind the SCP Foundation universe.
The Three Primary Containment Classes
Most anomalies cataloged in the database fall into the primary triad. These categories dictate the baseline security protocols required for day-to-day site operations.
Safe
Safe-class anomalies are items, entities, or phenomena that the Foundation thoroughly understands and can lock down permanently with minimal resources. Crucially, "Safe" doesn't mean harmless. A button that triggers a localized explosion if pressed is still Safe, provided it sits securely inside a reinforced locker and doesn't activate on its own. The defining trait is that containment remains stable unless someone intentionally interferes with the object.
Euclid
Euclid-class objects are either unpredictable or insufficiently understood. Reliable containment isn't always guaranteed, but the anomaly doesn't pose the catastrophic risks associated with higher tiers. As a general rule, any sentient or sapient entity—something that can think, reason, and act on its own volition—automatically lands in the Euclid category at minimum. Autonomous behavior introduces variables that standard automation can't fully predict.
Keter
Keter-class anomalies are notoriously difficult to contain. Procedures require extensive, complex resources, and containment often fails due to gaps in technology or understanding. People frequently assume Keter implies world-ending danger, but it simply means the entity requires constant, high-intensity upkeep to prevent breaches. Managing a Keter file drains heavy site resources and puts response teams on permanent alert.
Secondary and Narrative Categories
Beyond the primary triad, authors use specialized designations to handle edge cases, historical changes, or unusual interactions.
- Neutralized: Applied to anomalies that have been destroyed, disabled, or lost their anomalous properties entirely.
- Explained: Used when a phenomenon is fully debunked or absorbed into mainstream scientific understanding.
- Thaumiel: Rare, highly classified entities that the Foundation actively uses to contain other dangerous anomalies.
- Apollyon: Anomalies that cannot be contained and threaten imminent, global-scale breaches or end-of-the-world scenarios.
- Archon: Entities that could theoretically be locked away but are deliberately left uncontained because doing so would cause worse outcomes.
The Anomaly Classification System (ACS)
Modern articles frequently use the Anomaly Classification System (ACS), introduced to standardize how authors display information. Instead of relying on a single word, modern formatting splits classifications into three distinct visual blocks:
- Containment Class: The standard difficulty rating (Safe, Euclid, Keter, etc.).
- Risk Class: How dangerous the anomaly is to anyone nearby, ranging from low-threat variants to black-tier global hazards.
- Disruption Class: How far-reaching the effects of a containment breach would spread, from localized room disruptions to multi-universal crises.
Separating these metrics stops writers from cramming too much meaning into a single label. An object can be Safe to contain while carrying a high risk factor if mishandled.
Common Mistakes When Assigning Classes
Writers and fans often trip over a few persistent misconceptions when evaluating file drafts.
- Confusing Danger with Difficulty: Rating a harmless object as Keter because it teleports randomly across galaxies. If it's impossible to track or secure, difficulty dictates the Keter label, even if it doesn't attack people.
- Ignoring Sapience Rules: Giving a conscious, talking entity a Safe rating just because it sits quietly in a chair. Sapience introduces unpredictability, pushing it to Euclid.
- Overusing Esoteric Tags: Dropping rare classes like Apollyon or Thaumiel on every new draft. Overusing special labels dilutes their narrative impact. Most standard items fit comfortably into Safe, Euclid, or Keter.
Frequently Asked Questions
Can an object change its containment class?
Yes. If researchers figure out how to neutralize an anomaly's unpredictable triggers, a Keter or Euclid object can be reclassified down to Safe. Conversely, a stable item that suddenly mutates will get bumped up.
What does a Neutralized classification mean for the file?
The document remains in the database for historical and research posterity. If the anomaly ever wakes back up or regains its properties, staff update the status immediately.
Are all humanoid entities classified as Keter?
No. While many humanoids possess dangerous anomalies, humanoids with cooperative behavior or predictable needs often sit comfortably in the Euclid tier.
Why do some articles feature custom esoteric classes?
Authors invent custom classes to serve specific narrative hooks within individual stories. While the community encourages sticking to standard classes for most drafts, unique narrative concepts sometimes demand a bespoke label.
