SCP Foundation: Object Class Apollyon

Used for SCPs that are impossible to contain, or are about to irrevocably break containment. An SCP with this class will inevitably end the world.

The Bizarre and Bewildering World of Apollyon SCP Entities - Tim Kane Books

SCP Foundation, Villains Wiki

SCP Foundation Object Classes Chart (Redesign) by jordanli04 on DeviantArt

The SCP Foundation – SCP-3999

Containment level logos (TheVolgun) : r/SCP

Steam Workshop::SCP: Apollyon

What is the most dangerous class of SCP? - Quora

The wall is not enough to keep henry so he needs to be in the SCP Foundation - Imgflip

SEP OBJECT CLASSES KETER EUCLID EXPLAINED NEUTRALISED yyauyMIEL APOLLYON ESOTERIC - iFunny Brazil

SCP Declassified

Object Classes Redesign. It looks cool af SCP FOUNDATION OBJECT CLASSES DECOMISSIONED EXPLAINED - iFunny Brazil

A complete guide to SCP object classes (based on u/Cooldude971's list): SCP

SCP-2317-K - The Devourer of Worlds SCP FOUNDATION: SECURE. CONTAIN. PROTECT. - OBJECT CLASS: APOLLYON /

SCP ACS Diagram (I saw another one somewhere on here, but it didn't have all the info I wanted, so I made a more accurate, but uglier version) : r/ SCP

Had a few minutes free in class, so I decided to give class icons an attempt. : r/SCP