Before we start, I will explain the classes of the SCP foundation. We will talk about them with the box metaphor.
Safe: The SCP can easily be contained and is understood on what it does. There is a small danger present however, but you have to be an advanced level dunce to actually get killed by it.
This box is closed and you can go near it. You can open anytime you like. Be smart and everything is fine.
Euclid: These SCPs are probably dangerous but they seem to be well contained and somewhat understandable. However, it's best to stay away from it.
This box is somewhat sealed and there is danger within it. It's a mysterious box you probably shouldn't open.
Keter: Now things are about to get out of hand. Anything with this class, you should really not go anywhere near. This SCP is definitely dangerous, unpredictable, and not easy to contain. Stay well away.
This box is hard to keep the anomaly inside. Probably because it's dangerous.
Thaumiel: These SCPs usually don't harm that much. They mostly help the foundation in experiments and tests.
This anomaly IS the box.
Apollyon: If you see this thing anywhere, you better evacuate. This SCP cannot be contained and could potentially end the world by killing everyone off. It's incredibly dangerous, very unpredictable, will most definitely kill you, and it cannot be contained. So it's the end as we know it if you encounter this.
There is no box because it cannot be contained and it's killing everyone.
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