SCP-751 (classified as Euclid) is an amorphous parasite that feeds off of the organs of humans and other mammals. The majority of


SCP-751's body is made up of an unknown substance with a gelatin-like consistency, with red veins running through it. The veins contain a mix of blood from its progenitor's hosts along with varying anesthetics and immunosuppressive drugs. SCP-751 lives in damp environments such as freshwater bodies of water, swamps, rainforests, and sewers. It will leave these environments when in search of a host, traveling for a maximum of 12 hours before succumbing to dehydration.

SCP-751 begins its feeding process by siting itself on top of a sleeping host's stomach and begins to enter through the skin by osmosis. The anesthetics in SCP-751's veins mix with the host's blood at this time, minimizing the chance of the host awakening during the process. Once in the host's body, SCP-751 rests inside the stomach, quickly shaping itself to line the stomach walls. Over the course of the next two (2) or three (3) hours, SCP-751 adapts to closely match that of the host's stomach, maintaining digestive processes. When the host awakens, there is little or no evidence of any incident and the host will continue normally.

Over the next 3 to 4 days, SCP-751 will digest/replicate the host's organs (SCP-751's feeding process takes approximately 1 month in a human host, and longer in larger hosts), until the host's skin can't hold SCP-751, thus SCP-751 explodes out of the host's body, killing the host. After this, SCP-751 will reproduce, dividing into 10 to 20 smaller SCP-751's, which then move to the nearest damp area to grow in preparation of hunting for their own hosts.

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