SEP-843, also known as the "Corruption Essence," is an extremely dangerous and mysterious sentient material that was discovered by the Secret Experimental Project (SEP) Foundation. It is classified as a Red-level threat, indicating its high potential for causing harm and its dangerous nature. The appearance of SEP-843 is that of an oozing black goo, which emits a violet glow. It was found hidden within a hollow rock inside a cave on a rogue dark asteroid, wandering in the vastness of interstellar space. The material possesses magical properties, which make it all the more intriguing and ominous. When in contact with living organisms, SEP-843 infects plants, corrupting them into black, twisted versions known as "corrupted black plants." These corrupted forests bear a striking resemblance to the terraria found in the popular video game of the same name. Animals that come into contact with this material are transformed into nightmarish creatures, completely changing their physical form and behavior. Furthermore, SEP-843 can contaminate water and air, spreading infectious fluids throughout the environment. This includes both the atmosphere and the depths of the ocean. The infection can be transmitted through touch and even smelling the infectious fluids released by the material. Perhaps the most alarming aspect of SEP-843 is its ability to corrupt humans. Those exposed to the material undergo a horrifying transformation, turning into black, demonic, and nearly invincible void monsters. These creatures exhibit pure evil and pose a significant threat to anyone they encounter. Due to the immense danger posed by SEP-843 and its potential for widespread devastation, the SEP Foundation has taken extensive measures to contain and study the material. Researchers continue to work diligently towards finding a way to neutralize its effects and safeguarding humanity from its corrupting influence.