ENO Level 3
At Level 3, an ENO is contained entirely within a physical system or systems, and only relied on external code traffic or avatars to communicate with the worldwide network.

These ENOs will take over unprotected home machines above a certain power or memory threshold, but are also known to take over data storage banks, server farms, and enterprise computing. Their isolation from the wider network, and their ability to close off all external connections and remain viable, makes them especially difficult to destroy.

Block 171, a group of abandoned homes in Detroit that was found to be host to an ENO Level 3, is a good example of this. The entire area needed to be manually disconnected from the electricity grid and demolished house by house.

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